JP2021153882A - Optometer and optometry program - Google Patents

Abstract

To complete measurement smoothly without taking time in a photorefraction type optometer.SOLUTION: An optometer for objectively measuring eye refractive power of an eye to be examined by a photorefraction method includes: a light projection optical system having a plurality of measurement light sources arranged in a meridian direction with an optical axis center as a reference for irradiating the ocular fundus of the eye to be examined with measurement light emitted from the plurality of measurement light sources; a light reception optical system for detecting, by a detector, reflection light of the measurement light reflected by the ocular fundus of the eye to be examined; light source control means for sequentially lighting the plurality of measurement light sources; and control means for acquiring first eye refractive power of the eye to be examined on the basis of a result of the detection of the reflection light of the plurality of measurement light sources which have been sequentially lighted. The control means acquires second eye refractive power of the eye to be examined on the basis of the reflection light of the measurement light by a predetermined measurement light source of the plurality of measurement light sources, and outputs the second eye refractive power as the eye refractive power of the eye to be examined.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an optometry device and an optometry program for objectively measuring the refractive power of the eye to be inspected.

For example, as an optometry device that objectively measures the optical power of the eye to be inspected, a photorefraction type optometry that objectively measures the optical power of the eye to be inspected from the ratio of the reflected light from the fundus of the eye to be inspected in the pupil. The device is known (see Patent Document 1).

For example, such a photorefraction type optometry apparatus has a plurality of measurement light sources arranged in the meridian direction with respect to the center of the optical axis. For example, a photorefraction type optometry device sequentially turns on a plurality of measurement light sources, detects the reflected light from the fundus of the sequentially turned on measurement light, and refracts the eye of the eye to be inspected based on the detected detection result. I'm getting power.

Japanese Unexamined Patent Publication No. 2006-149501

By the way, the above-mentioned photorefraction type optometry apparatus sequentially turns on a plurality of measurement light sources, detects the reflected light from the fundus of the sequentially turned on measurement light, and receives the light based on the detected detection result. Obtained the refractive power of the eye for optometry. Therefore, it may take time to measure and analyze the measurement result.

In view of the above-mentioned prior art, it is a technical subject of the present disclosure to provide an optometry device that smoothly completes a measurement in a photorefraction type optometry device without taking time.

In order to solve the above problems, the present invention is characterized by having the following configurations.

(1) The eye examination device according to the first aspect of the present disclosure is an eye examination device that objectively measures the ocular refractive force of the eye to be inspected by a photorefraction method, and is arranged in the longitudinal direction with respect to the center of the optical axis. A light projection optical system having a plurality of measurement light sources and irradiating the fundus of the eye to be inspected with the measurement light emitted from the plurality of measurement light sources, and the reflected light of the measurement light reflected by the fundus of the eye to be inspected. The first of the eyes to be inspected based on the detection result of the light receiving optical system that detects the The control means includes a control means for acquiring the eye refractive force, and the control means obtains the second eye refractive force of the eye to be inspected based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources. It is characterized in that the second eye refractive force is acquired and output as the eye refractive force of the eye to be inspected.
(2) The eye examination program according to the second aspect of the present disclosure is an eye examination device that objectively measures the ocular refractive force of the eye to be inspected by a photorefraction method, and is arranged in the longitudinal direction with reference to the center of the optical axis. A projection optical system having a plurality of measurement light sources and irradiating the fundus of the eye to be inspected with the measurement light emitted from the plurality of measurement light sources, and the reflected light of the measurement light reflected by the fundus of the eye to be inspected. First of the eye to be inspected based on the detection result of the light receiving optical system that detects the An eye examination program used in an eye examination device including a control means for acquiring an eye refractive force, which is executed by a processor of the eye examination device to obtain measurement light from a predetermined measurement light source among a plurality of measurement light sources. The eye examination device is made to perform an output step of acquiring the second eye refractive force of the eye to be inspected based on the reflected light and outputting the second eye refractive force as the eye refractive force of the eye to be inspected. It is characterized by that.

It is a figure explaining the structure of the optometry apparatus. The figure when the measurement light source is seen from the front direction is shown. It is a figure explaining the photorefraction method. It is a figure which shows one of the transformation examples in the configuration of an optometry apparatus. It is a schematic block diagram of the control system in an optometry apparatus. It is a figure which shows the flowchart explaining the inspection flow of the inspection apparatus using the measurement mode switching in this Example. It is a figure explaining the lighting of the measurement light source in a normal measurement mode. It is a figure explaining the lighting of the measurement light source in the simple measurement mode. It is a figure explaining the optometry flow of the transformation example. It is a figure explaining the lighting of the measurement light source in the pre-measurement mode. It is a figure explaining the transformation example of the lighting of the measurement light source in this measurement mode.

<Overview>
Hereinafter, one of the typical embodiments will be described with reference to the drawings. 1 to 11 are views for explaining the optometry apparatus according to the present embodiment. The items classified by <> below can be used independently or in relation to each other.

In the following description, the depth direction of the eye examination device (the front-back direction of the subject when measuring the subject) is perpendicular to the Z direction and the depth direction (of the subject when measuring the subject). The horizontal direction on the plane (horizontal direction) will be described as the X direction, and the vertical direction (vertical direction of the subject when measuring the subject) will be described as the Y direction.

For example, the optometry device of the present embodiment (for example, the optometry device 1) objectively measures the refractive power of the eye to be inspected by a photorefraction method. For example, the optical power may be at least one of spherical information (for example, spherical power (S)), astigmatism information (for example, at least one of astigmatism power (C) and astigmatism axis angle (A), etc.). There may be. For example, the photorefraction type optometry device objectively measures the refractive power of the eye to be inspected from the ratio of the reflected light from the fundus of the eye to be inspected in the pupil (details will be described later).

For example, the optometry apparatus has a light projecting optical system (for example, a light emitting optical system 10) and a light receiving optical system (for example, a light receiving optical system 20).

For example, the projection optical system has a plurality of measurement light sources (for example, measurement light sources 13) arranged in the longitudinal direction (radial direction) with reference to the center of the optical axis (for example, the center O1 of the optical axis), and a plurality of measurements are performed. The measurement light emitted from the light source is applied to the fundus of the eye to be inspected. For example, the light receiving optical system receives the reflected light of the measurement light reflected by the fundus of the eye to be inspected by a detector (for example, the detector 21). As an example, when the measurement light sources are arranged in order in the meridian direction, the measurement light sources may be arranged in order on a virtual straight line extending in the meridian direction with reference to the center of the optical axis.

For example, the meridian direction in which the measurement light source is arranged can be any number of meridian directions (for example, 1 meridian direction, 2 meridian direction, 3 meridian direction, 4 meridian direction, etc.). As an example, for example, a plurality of measurement light sources may be separated from each other with respect to at least three meridian directions with respect to the center of the optical axis so that the respective measurement light sources are arranged. By arranging the measurement light sources in at least three meridian directions in this way, it is possible to measure the optical refractive power including the spherical power, the astigmatic power, and the astigmatic axis angle. For example, by arranging a measurement light source in the one meridian direction, the spherical power can be measured as an optical power.

For example, at least one or more measurement light sources may be arranged symmetrically with respect to the center of the optical axis in one meridian direction. For example, at least one or more measurement light sources may be arranged with one measurement light source, or at least two or more measurement light sources may be arranged (measurement light sources are arranged as a set). Of course, the measurement light sources (at least one or more measurement light sources) may not be arranged symmetrically with respect to the center of the optical axis in one meridian direction. That is, the measurement light source may be arranged on only one side with respect to the center of the optical axis in one meridian direction.

The arrangement position of the plurality of measurement light sources is not limited to the above arrangement position. It can be placed in any position.

For example, the plurality of measurement light sources may be able to be controlled independently. For example, lighting of each measurement light source, adjustment of the amount of light, and the like may be controlled independently.

For example, the projection optical system may include an objective optical system. In this case, for example, the objective optical system irradiates the fundus of the eye to be inspected with measurement light emitted from a plurality of measurement light sources. For example, the objective optical system may include at least one or more optical members that project the measurement light toward the eye to be inspected. For example, the floodlight optical system may have at least a configuration having a measurement light source.

For example, the light receiving optical system may include an objective optical system (for example, an objective lens 26). In this case, for example, the objective optical system guides the reflected light of the measurement light reflected by the fundus of the eye to be inspected to the detector. For example, the objective optical system may include at least one or more optical members for guiding the reflected light of the measurement light reflected by the fundus of the eye to be inspected to the detector. For example, the light receiving optical system may have at least a detector.

In addition, for example, at least a part of the optical members of the light projecting optical system and the light receiving optical system may be used in combination. Of course, each may be composed of different optical members.

For example, the projection optical system can be arranged at any position. Further, for example, the light receiving optical system can be arranged at an arbitrary position.

For example, at least one of the light projecting optical system and the light receiving optical system may have a pair of left and right optical systems. As an example, the optometry device may be configured to include a pair of left and right eye projection optical systems, a left eye projection optical system, and one light receiving optical system. In this case, for example, the measurement light from the right-eye projection optical system and the left-eye projection optical system provided in pairs on the left and right may be simultaneously received by the light receiving optical system. Further, in this case, for example, the light receiving timing of each measurement light is switched from the right eye projection optical system and the left eye projection optical system provided in pairs on the left and right, and the light is received by the light receiving optical system. You may. In this embodiment, simultaneous means include substantially simultaneous.

Further, as an example, for example, the eye examination device includes a pair of left and right eye projection optical systems and a left eye projection optical system, and a pair of left and right light receiving optical systems and a left eye. It may be configured to include a light receiving optical system. In this case, for example, the measurement light from the right eye projection optical system and the left eye projection optical system provided in pairs on the left and right is simultaneously received by the right eye light receiving optical system and the left eye light receiving optical system. It may be configured to be. Further, in this case, for example, the timing at which the measurement light from the right eye projection optical system and the left eye projection optical system provided in pairs on the left and right differs between the right eye light receiving optical system and the left eye light receiving optical system. It may be configured to receive light at. In this embodiment, simultaneous means include substantially simultaneous.

For example, in the present embodiment, when the projection optical system has a pair of left and right eye projection optical systems and a left eye projection optical system, a pair of left and right measurement light sources are used. You may do so. For example, in the right-eye projection optical system and the left-eye projection optical system, the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system are composed of the same members. It may have been. Further, for example, the right-eye projection optical system and the left-eye projection optical system are at least a part of the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system. The members may be composed of different members. For example, in the right eye projection optical system and the left eye projection optical system, at least a part of the members constituting the right eye projection optical system and the members constituting the left eye projection optical system is used. It may be a configuration that is also used. Further, for example, in the right eye projection optical system and the left eye projection optical system, a member constituting the right eye projection optical system and a member constituting the left eye projection optical system are separately provided. It may be the configuration that is provided.

For example, in the present embodiment, when the light receiving optical system has a light receiving optical system for the right eye and a light receiving optical system for the left eye provided in pairs on the left and right, a pair of detectors provided on the left and right may be used. .. For example, in the light receiving optical system for the right eye and the light receiving optical system for the left eye, even if the member constituting the light receiving optical system for the right eye and the member constituting the light receiving optical system for the left eye are composed of the same member. good. Further, for example, the light receiving optical system for the right eye and the light receiving optical system for the left eye are members in which at least a part of the members is different between the member constituting the light receiving optical system for the right eye and the member constituting the light receiving optical system for the left eye. It may be composed of. For example, in the light receiving optical system for the right eye and the light receiving optical system for the left eye, at least a part of the members constituting the light receiving optical system for the right eye and the member constituting the light receiving optical system for the left eye are shared. It may be a configuration. Further, for example, the light receiving optical system for the right eye and the light receiving optical system for the left eye are configured in which a member constituting the light receiving optical system for the right eye and a member constituting the light receiving optical system for the left eye are separately provided. It may be.

For example, the measurements of the left and right eyes to be inspected may be performed at the same timing or at different timings.

For example, the optometry apparatus of this embodiment includes a light source control means (for example, a control unit 80). For example, the light source control means controls the lighting of a plurality of measurement light sources. As an example, for example, the light source control means turns on a plurality of measurement light sources in sequence. For example, the light source control means may control the lighting of a plurality of measurement light sources by one light source control means. Further, for example, the light source control means may have a plurality of light source control means, and the lighting of the plurality of measurement light sources may be controlled by the plurality of light source control means.

For example, the optometry apparatus of this embodiment includes a control means (for example, a control unit 80). For example, the control means acquires the optical power based on the detection result of the reflected light. Further, for example, the control means outputs the acquired ocular refractive power. For example, the control means may be one control means. Further, for example, the control means may have a plurality of control means.

For example, as a configuration for acquiring the optical power of the eye, the control means measures the first optical power of the eye to be inspected (for example, the first spherical power and the first spherical power) based on the detection results of the reflected light of a plurality of measurement light sources that are sequentially turned on. At least one of 1 astigmatic power and 1st astigmatic axis angle) is acquired. Further, for example, the control means may output the acquired first eye refractive power as the eye refractive power of the eye to be inspected.

Further, for example, as a configuration for acquiring the optical power of the eye, the control means has a second optical power of the eye to be inspected (for example, a second eye) based on the reflected light of the measurement light by a predetermined measurement light source among the plurality of measurement light sources. The bispherical power, the second random vision power, and the second random vision axis angle) are acquired, and the second eye refractive power is output as the eye refractive power of the eye to be inspected. As described above, the eye examination device that objectively measures the ocular refractive force of the eye to be inspected by the photorefraction method in the present embodiment has a plurality of measurement light sources arranged in the meridian direction with respect to the center of the optical axis. A light projecting optical system that irradiates the fundus of the eye to be examined with the measurement light emitted from a plurality of measurement light sources, and a light receiving optical system that detects the reflected light of the measurement light reflected by the fundus of the eye to be examined by a detector. A light source control means for sequentially lighting the measurement light sources and a control means for acquiring the first eye refractive force of the eye to be inspected based on the detection results of the reflected light of the plurality of measurement light sources that are sequentially turned on are provided. Further, for example, the control means acquires the second eye refractive power of the eye to be inspected based on the reflected light of the measurement light by a predetermined measurement light source among the plurality of measurement light sources, and sets the second eye refractive power to the eye to be inspected. It is output as the optical power of the eye. With such a configuration, the measurement can be completed smoothly without spending time.

For example, the predetermined measurement light source may be a smaller number of measurement light sources than a plurality of measurement light sources arranged in the eye examination device (a plurality of measurement light sources arranged in the longitudinal direction with respect to the center of the optical axis). That is, for example, the predetermined measurement light source may be a part of the measurement light sources among the plurality of measurement light sources arranged in the optometry device (all measurement light sources arranged in the optometry device).

For example, when at least one or more measurement light sources are arranged in one meridian direction, one measurement light source may be used as a predetermined measurement light source in one meridian direction measurement light source. A plurality of measurement light sources may be used.

Further, for example, when at least one or more measurement light sources are arranged in each of a plurality of meridian directions, a measurement light source in a predetermined meridian direction may be used as the predetermined measurement light source. In this case, for example, as the predetermined measurement light source, all the measurement light sources arranged in the predetermined meridian direction may be used in the measurement light sources arranged in the predetermined meridian direction. Further, in this case, for example, as a predetermined measurement light source, only a part of the measurement light sources arranged in the predetermined meridian direction is used in the measurement light sources arranged in the predetermined meridian direction. May be good.

For example, in the present embodiment, the control means outputs the second eye refractive power as the eye refractive power of the eye to be inspected. For example, the control means may output the second eye refractive power as the eye refractive power of the eye to be inspected, and the control means may display the second eye refractive power on the display means (for example, the display 11). .. Further, for example, the control means may output the second eye refractive power as the eye refractive power of the eye to be inspected, and the control means may print the second eye refractive power on a medium (for example, paper). good. Further, for example, as a configuration in which the control means outputs the second eye refractive power as the eye refractive power of the eye to be inspected, the control means directs the second eye refractive power to another device (control means for controlling the other device). It may be configured to transmit. In this case, for example, another device may receive the second-eye refractive power and perform various controls based on the received second-eye refractive power. That is, in the present embodiment, the control means outputs the eye refractive power (for example, the first eye refractive power, the third eye refractive power, etc., which will be described later) as a configuration to be displayed on the display means or printed on a medium. It may be at least one of a configuration, a configuration for transmitting an optical power to another device, and the like.

For example, when acquiring the second eye refractive power, the measurement with a predetermined measurement light source required for acquiring the second eye refractive power may be completed in advance. In this case, for example, when the measurement with a plurality of measurement light sources (a plurality of measurement light sources arranged in the eye examination device) is completed in advance and the second eye refractive power is acquired, the plurality of measurements measured in advance are performed. From the detection results of the reflected light by the light source, the detection result of the reflected light by a predetermined measurement light source for acquiring the second eye refractive power is selected, and the second eye refractive power is acquired based on the selected detection result. You may try to do it. That is, for example, when the control means acquires the second eye refractive power, a predetermined measurement for acquiring the second eye refractive power from the detection results of the reflected light by the plurality of measurement light sources measured in advance. The detection result of the reflected light by the light source may be selected, and the second eye refractive power may be acquired based on the selected detection result. In this way, by completing the measurement in advance, it is sufficient to perform only the analysis as needed, so that the measurement can be completed more smoothly.

Further, for example, in the case of acquiring the second eye refractive power, measurement by a predetermined measurement light source may be additionally performed when acquiring the second eye refractive power. In this case, for example, when acquiring the second eye refractive power, a predetermined measurement light source for acquiring the second eye refractive power is turned on, and the second is based on the detection result of the reflected light by the predetermined measurement light source. The refractive power of the eye may be acquired. That is, for example, when acquiring the second eye refractive power, the light source control means may selectively turn on a predetermined measurement light source. Further, for example, the control means may acquire the second eye refractive power based on the reflected light of the measurement light by the predetermined measurement light source that is selectively turned on. In this way, when the second eye refractive power is acquired, by performing additional measurement, only the measurement is performed as needed, so that the measurement can be completed more smoothly.

<Measurement processing switching>
For example, in the optometry apparatus of the present embodiment, the first measurement process for measuring the first eye refractive power and the second measurement process for measuring the second eye refractive power may be switched. In this case, for example, the optometry device acquires the first optical power of the eye to be inspected and outputs the first optical power as the optical power of the eye to be inspected, and the second measurement process of the eye to be inspected. The measurement process switching means (for example, the control unit 80) for switching the measurement process between the second measurement process for acquiring the second measurement process and outputting the second eye refractive power as the optical power of the eye to be inspected may be provided. For example, the first measurement process is a measurement process in which the first eye refractive power of the eye to be inspected is acquired based on the detection results of the reflected light of a plurality of measurement light sources that are sequentially turned on and output as the eye refractive power of the eye to be inspected. .. Further, for example, in the second measurement process, the second eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources, and the second eye refractive power is determined. This is a measurement process that outputs the optical power of the eye to be inspected. For example, the measurement process is not limited to the two measurement processes of the first measurement process and the second measurement process, and a plurality of measurement processes may be set.

As described above, for example, the eye examination device acquires the first eye refractive power of the eye to be inspected based on the detection results of the reflected light of the plurality of measurement light sources that are sequentially turned on, and outputs the first eye refractive power of the eye to be inspected as the eye refractive power of the eye to be inspected. The second eye refractive power of the eye to be inspected is acquired based on the measurement process and the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources, and the second eye refractive power is set to the eye refractive power of the eye to be inspected. The second measurement process to be output as, and the measurement process switching means for switching the measurement process may be provided. With such a configuration, for example, in a photorefraction type optometry device, even if the eye to be inspected cannot be measured satisfactorily and the measurement takes a long time, the measurement result can be obtained smoothly and easily. can.

For example, when switching between the first measurement process and the second measurement process, the configuration may be such that the switching may be performed by the operation of the examiner's operating means (for example, the controller 81). For example, the measurement process switching means may switch the measurement process by the examiner operating the operating means. In this case, for example, the examiner has a storage means (for example, a first measurement mode in which the first measurement process is performed and a second measurement mode in which the second measurement process is performed) in which each measurement process is associated. For example, it is stored in the memory 82), and the examiner operates the operating means to select the measurement mode. For example, the measurement process switching means may set the measurement process corresponding to the measurement mode selected by the examiner when the measurement mode is selected. The guide information for switching the measurement process may be displayed on the display means. For example, the guide information includes a judgment result indicating the quality of the measurement of the eye to be inspected, judgment-related information based on the judgment result (for example, warning information indicating that the measurement is difficult, information prompting remeasurement, and posture of the subject. At least one of the information, etc. that prompts the adjustment, etc.), the time elapsed since the start of the measurement, and the like. Of course, guide information different from the above may be used.

Further, for example, when switching between the first measurement process and the second measurement process, the configuration may be such that the first measurement process and the second measurement process are automatically switched based on a predetermined condition. As a configuration for automatically switching, for example, the measurement process switching means may switch the measurement process from the first measurement process to the second measurement process when the measurement of the eye to be inspected elapses for a predetermined time. .. With such a configuration, for example, in a photorefraction type optometry apparatus, it is possible to switch the measurement process from the first measurement process to the second measurement process based on the passage of the measurement time, so that complicated processing is not required and it is easy. With the configuration, the measurement can be completed smoothly.

Further, as a configuration that is automatically switched, for example, when the measurement process switching means determines the quality of the measurement of the eye to be inspected in the first measurement process and determines that the measurement of the eye to be inspected in the first measurement process is not good. , The measurement process may be switched from the first measurement process to the second measurement process. With such a configuration, for example, in a photorefraction type optometry apparatus, the quality of the measurement in the first measurement process is determined, and when the measurement is not good, the second measurement process can be performed more easily. By being able to switch the measurement process, it is possible to complete the measurement more smoothly even for the eye to be inspected, for which the measurement cannot be performed well in the first measurement process.

For example, the quality of the measurement of the eye to be inspected in the first measurement process may be determined based on the detection result by the light receiving optical system. In this case, for example, the measurement processing switching means is
In the measurement of the eye to be inspected in the first measurement process, it is determined whether or not each detection result by a plurality of measurement light sources can be obtained, and at least one or more of the detection results by the plurality of measurement light sources are detected. If the result cannot be obtained, it may be determined that the measurement of the eye to be inspected in the first measurement process is not good, and the measurement process may be switched from the first measurement process to the second measurement process.

For example, the quality of the measurement of the eye to be inspected in the first measurement process may be determined based on the measurement time. In this case, the measurement process switching means determines whether or not the measurement of the eye to be inspected in the first measurement process is completed when a predetermined time has elapsed, and the measurement of the eye to be inspected in the first measurement process is carried out for a predetermined time. If it is not completed even after the lapse of time, it may be determined that the measurement of the eye to be inspected in the first measurement process is not good, and the measurement process may be switched from the first measurement process to the second measurement process. .. For example, the predetermined time may be set in advance as the time required for the measurement to be completed by simulation, experiment, or the like (for example, the average measurement time until the measurement is completed). Of course, for example, any time can be set as the predetermined time. With such a configuration, for example, in a photorefraction type optometry apparatus, it is possible to determine the quality of measurement based on the passage of measurement time and switch the measurement process from the first measurement process to the second measurement process, which is complicated. The measurement can be completed smoothly with a simple configuration that does not require any complicated processing.

Of course, for example, the determination of the quality of the measurement of the eye to be inspected in the first measurement process is not limited to the above configuration, and can be applied as long as it is a processing method capable of determining the quality of the measurement of the eye to be inspected.

In addition, for example, in the second measurement process, when the second eye refractive power is acquired, only the spherical power may be acquired. For example, the spherical power can be obtained by using at least one measurement light source (for example, one measurement light source or a plurality of measurement light sources) in at least one meridian direction. That is, the spherical power can be obtained more easily than other eye refractive powers, and can be easily obtained even when the number of measurement light sources is small. In this case, for example, in the second measurement process, the predetermined measurement light source is at least one measurement light source arranged in one meridian direction with respect to the center of the optical axis, and the reflection of the measurement light by at least one measurement light source. Based on the light, only the spherical power may be acquired as the second eye refractive force. As described above, for example, by using only a plurality of measurement light sources arranged in at least one meridian direction, it is possible to obtain the spherical power more smoothly and accurately.

<Acquisition of optical power based on eye refractive power or ratio>
For example, the inventors have found that the position of the measurement light source from which an accurate measurement result can be obtained differs depending on the refractive power of the eye to be measured. Therefore, in the present embodiment, for example, the eye refractive power output as the eye refractive power of the eye to be inspected based on whether or not the second eye refractive power (absolute value of the second eye refractive power) satisfies a predetermined criterion. May be newly acquired. For example, the eye refractive power to be output as the eye refractive power of the eye to be inspected may be newly acquired based on whether or not the second eye refractive power satisfies a predetermined criterion. In this case, for example, the control means may be a measurement light source used for acquiring the second eye refractive power from a plurality of measurement light sources based on whether or not the second eye refractive power satisfies a predetermined criterion. May acquire the third eye refractive power of the eye to be inspected based on the reflected light of the measurement light by a different measurement light source, and output the third eye refractive power as the eye refractive power of the eye to be inspected. As a result, the measurement light source used for acquiring the optical power can be selected according to the optical power of the eye to be inspected, so that the measurement can be smoothly completed for the eye to be inspected with various optical powers. At the same time, more accurate measurement results can be obtained.

In addition, for example, a predetermined standard may be obtained by simulation, experiment, or the like. In this case, for example, the predetermined reference may be set so that the refractive power of the eye to be inspected can be obtained with high accuracy. Of course, for example, a predetermined standard may be configured to be arbitrarily set by the examiner.

For example, a predetermined optical power may be used as a predetermined reference. In this case, for example, the control means is a measurement used when acquiring the second eye refractive power from a plurality of measurement light sources based on whether or not the second eye refractive power satisfies a predetermined eye refractive power. The third eye refractive power of the eye to be inspected may be acquired based on the reflected light of the measurement light by the measurement light source different from the light source, and the third eye refractive power may be output as the eye refractive power of the eye to be inspected. For example, the predetermined optical power may be at least one of spherical information (for example, spherical power) and astigmatism information (for example, astigmatic power). As an example, when a predetermined ocular refractive power is set by a spherical power, for example, the control means may perform a plurality of measurements based on whether or not the second spherical power, which is the second eye refractive power, satisfies the predetermined spherical power. From among the light sources, the third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light from the measurement light source different from the measurement light source used when acquiring the second eye refractive power, and the third eye refractive power is acquired. May be output as the optical power of the eye to be inspected.

For example, when a predetermined ocular refractive power is used as a predetermined reference, the predetermined ocular refractive power may be obtained by simulation, experiment, or the like. In this case, for example, the predetermined optical power may be set as a standard for accurately obtaining the optical power of the eye to be inspected. Of course, for example, the predetermined ocular refractive power may be configured to be arbitrarily set by the examiner.

For example, when a predetermined ocular refractive power is used as a predetermined reference, the configuration of whether or not the predetermined ocular refractive power is satisfied is based on whether or not the predetermined ocular refractive power is larger than the predetermined ocular refractive power, and the third eye of the eye to be examined. The refractive power may be acquired and the third eye refractive power may be output as the eye refractive power of the eye to be examined. In this case, for example, the control means is used to acquire the second eye refractive force from a plurality of measurement light sources based on whether or not the second eye refractive force is larger than a predetermined eye refractive force. The third eye refractive force of the eye to be inspected may be acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source, and the third eye refractive force may be output as the eye refractive force of the eye to be inspected.

Further, for example, when a predetermined ocular refractive power is used as a predetermined reference, the configuration of whether or not the predetermined ocular refractive power is satisfied is based on whether or not the predetermined ocular refractive power is smaller than the predetermined ocular refractive power. The third eye refractive power may be acquired and the third eye refractive power may be output as the eye refractive power of the eye to be inspected. In this case, for example, the control means is used to acquire the second eye refractive force from a plurality of measurement light sources based on whether or not the second eye refractive force is smaller than a predetermined eye refractive force. The third eye refractive force of the eye to be inspected may be acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source, and the third eye refractive force may be output as the eye refractive force of the eye to be inspected.

Of course, for example, the configuration when a predetermined ocular refractive power is used as a predetermined reference is not limited to the above configuration. The configuration may be such that it is selected whether or not to acquire the third eye refractive power of the eye to be inspected based on a predetermined optical power of refraction. In this case, for example, the third eye refractive power of the eye to be examined is acquired based on whether or not the refractive power of the second eye falls within a predetermined range of the optical power of the eye to be examined, and the refractive power of the third eye is set to the eye of the eye to be examined. It may be output as a refractive power.

Further, in the present embodiment, for example, the ratio of the reflected light from the fundus of the eye to be inspected in the pupil (for example, the dimensional ratio of the bright crescent K in the pupil to the pupil diameter described later (B / 2r)) satisfies a predetermined criterion. Based on whether or not, the eye refractive power output as the eye refractive power of the eye to be inspected may be newly acquired. In this case, for example, the control means acquires the second eye refractive power from the plurality of measurement light sources based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil satisfies a predetermined criterion. The third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source used at the time, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. May be good. As a result, the measurement light source used for acquiring the optical power can be selected according to the optical power of the eye to be inspected, so that the measurement can be smoothly completed for the eye to be inspected with various optical powers. At the same time, more accurate measurement results can be obtained.

For example, a predetermined ratio may be used as a predetermined standard. In this case, for example, the control means acquires the second eye refractive power from the plurality of measurement light sources based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil satisfies a predetermined ratio. The third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source used at the time, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. May be good.

For example, when a predetermined ratio is used as a predetermined standard, the predetermined ratio may be obtained by simulation, experiment, or the like. In this case, for example, a predetermined ratio may be set as a standard for accurately obtaining the refractive power of the eye to be inspected. Of course, for example, the predetermined ratio may be arbitrarily set by the examiner.

For example, when a predetermined ratio is used as a predetermined criterion, the configuration of whether or not the predetermined ratio is satisfied is based on whether or not the ratio is larger than the predetermined ratio, and the third eye refractive power of the eye to be inspected is acquired. , The third eye refractive power may be output as the eye refractive power of the eye to be inspected. In this case, for example, the control means acquires the second optical power from a plurality of measurement light sources based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil is larger than a predetermined ratio. The third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source used at the time, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. You may.

Further, for example, when a predetermined ratio is used as a predetermined standard, the configuration of whether or not the predetermined ratio is satisfied is based on whether or not the ratio is smaller than the predetermined ratio, and the third eye refractive power of the eye to be inspected is determined. It may be acquired and the third eye refractive power may be output as the eye refractive power of the eye to be inspected. In this case, for example, the control means acquires the second optical power from a plurality of measurement light sources based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil is smaller than a predetermined ratio. The third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source used at the time, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. You may.

Of course, for example, the configuration when a predetermined ratio is used as a predetermined reference is not limited to the above configuration. The configuration may be such that whether or not to acquire the third eye refractive power of the eye to be inspected is selected based on a predetermined ratio. In this case, for example, the third eye refractive power of the eye to be inspected is acquired based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil falls within a predetermined ratio range, and the third eye refractive power is obtained. May be output as the optical power of the eye to be inspected.

For example, the third eye refractive power may be acquired by using at least a measurement light source different from the predetermined measurement light source used when acquiring the second eye refractive power. In this case, for example, the control means acquires the third eye refractive power of the eye to be inspected based on the reflected light of the measurement light only by the measurement light source different from the predetermined measurement light source used when acquiring the second eye refractive power. You may. Further, in this case, for example, the control means is a measurement light source different from the predetermined measurement light source used when acquiring the second eye refractive power, and a predetermined measurement light source used when acquiring the second eye refractive power. The third eye refractive power of the eye to be inspected may be acquired based on the reflected light of the measurement light by at least one or more measurement light sources.

In addition, for example, among the measurement light sources different from the predetermined measurement light source used when the control means acquires the second eye refractive force, and the predetermined measurement light source used when acquiring the second eye refractive force. When the third eye refractive force of the eye to be examined is acquired based on the reflected light of the measurement light by at least one or more measurement light sources, the first eye refractive force is acquired as the third eye refractive force. May be good. That is, for example, the control means detects the reflected light of a plurality of measurement light sources that are sequentially turned on as the third eye refractive power based on whether or not the second eye refractive power is equal to or higher than a predetermined eye refractive power. The first eye refractive power of the eye to be inspected may be acquired based on the above and output as the optical power of the eye to be inspected.

For example, when acquiring the third eye refractive power, the measurement with a predetermined measurement light source required for acquiring the third eye refractive power may be completed in advance. In this case, for example, when the measurement with a plurality of measurement light sources (a plurality of measurement light sources arranged in the eye examination device) is completed in advance and the third eye refractive force is acquired, the plurality of measurements measured in advance are performed. From the detection results of the reflected light by the light source, a measurement including at least a measurement light source different from the predetermined measurement light source used for acquiring the second eye refractive force (measurement including at least a measurement light source for acquiring the third eye refractive force). The detection result of the reflected light by the light source) may be selected, and the third eye refractive force may be acquired based on the selected detection result. That is, for example, the control means is based on the measurement light source for acquiring the third eye refractive power from the detection results of the reflected light by the plurality of measurement light sources measured in advance when acquiring the third eye refractive power. The detection result of the reflected light may be selected, and the third eye refractive power may be acquired based on the selected detection result. In this way, by completing the measurement in advance, it is sufficient to perform only the analysis as needed, so that the measurement can be completed more smoothly.

Further, for example, when acquiring the third eye refractive power, measurement by a predetermined measurement light source may be additionally performed when acquiring the third eye refractive power. In this case, for example, when acquiring the third eye refractive force, a measurement different from the measurement light source for acquiring the third eye refractive force (measurement different from the predetermined measurement light source used for acquiring the second eye refractive force). A measurement light source including at least a light source) may be turned on, and the third eye refractive force may be acquired based on the detection result of the reflected light by the turned on measurement light source. That is, for example, when acquiring the third eye refractive power, the light source control means may selectively turn on the measurement light source for acquiring the third eye refractive power. Further, for example, the control means may acquire the third eye refractive power based on the reflected light of the measurement light by the measurement light source that is selectively turned on. In this way, when the third eye refractive power is acquired, by performing additional measurement, only the measurement is performed as needed, so that the measurement can be completed more smoothly.

In the present disclosure, for example, when the optical power of the eye to be measured is a low diopter (a diopter having a low absolute value of the optical power of the eye to be measured), the inventors are close to the center of the optical axis. Accurate measurement results can be obtained by using a measurement light source, and when the optical power of the eye to be measured is a high diopter (a diopter with a high absolute value of the optical power of the eye to be measured), light is used. We have found that accurate measurement results can be obtained by using a measurement light source that is far from the center of the axis. For example, when the refractive power of the eye to be measured has a low diopter such as -1D or + 1D (the absolute value of -1D and + 1D is 1), a measurement light source near the center of the optical axis is used. By using it, accurate measurement results can be obtained, and when the refractive power of the eye to be measured is a high diopter such as -10D or + 10D (10 as the absolute value of -10D and + 10D), light is used. We have found that accurate measurement results can be obtained by using a measurement light source far from the center of the axis.

As an example, for example, the second eye refractive power may be a lower diopter than the third eye refractive power (an eye refractive power of a lower diopter than the third eye refractive power). For example, the predetermined measurement light source used to acquire the second eye refractive power is located closer to the center of the optical axis in the meridian direction than the different measurement light sources used to acquire the third eye refractive power. It may be arranged in. Thus, for example, the predetermined measurement light source used to obtain the second eye refractive power has an optical axis in the meridian direction than the different measurement light sources used to obtain the third eye refractive power. By being placed near the center, when the second eye refractive power is lower than the third eye refractive power, the measurement is smoothly completed for the eyes under test with various optical powers. At the same time, more accurate measurement results can be obtained. That is, when acquiring the second eye refractive power, which is a lower diopter than the third eye refractive power, the measurement light source (for acquiring the third eye refractive power) arranged at a position close to the center of the optical axis. When acquiring the third eye refractive power, which is a higher diopter than the second eye refractive power, by using a measurement light source located closer to the center of the optical axis than the measurement light source, at least away from the center of the optical axis. By using a (far) measurement light source (a measurement light source arranged at a position farther from the center of the optical axis than the measurement light source for acquiring the second eye refractive power), it is possible to obtain various eye refractive powers for the eye to be inspected. , The measurement can be completed smoothly, and more accurate measurement results can be obtained.

Further, as an example, for example, the second eye refractive power may be a higher diopter than the third eye refractive power (an eye refractive power higher than the third eye refractive power). In this case, for example, the predetermined measurement light source used to acquire the second eye refractive power is centered on the optical axis in the meridian direction than the different measurement light sources used to acquire the third eye refractive power. It suffices to be arranged at a position away from. Thus, for example, the predetermined measurement light source used to obtain the second eye refractive power has an optical axis in the meridian direction than the different measurement light sources used to obtain the third eye refractive power. By being placed at a position far from the center, when the second eye refractive power is higher than the third eye refractive power, the measurement is smoothly completed for the eyes to be examined with various optical powers. At the same time, more accurate measurement results can be obtained. That is, when acquiring the second eye refractive power, which is a higher diopter than the third eye refractive power, the measurement light source (for acquiring the third eye refractive power) located at a position far from the center of the optical axis. When a third eye refractive power, which is a lower diopter than the second eye refractive power, is obtained by using a measurement light source located farther from the center of the optical axis than the measurement light source, it is at least close to the center of the optical axis. By using a measurement light source (a measurement light source located closer to the center of the optical axis than the measurement light source for acquiring the second optical power), the measurement can be smoothly performed for the eyes to be inspected with various optical powers. It can be completed and more accurate measurement results can be obtained.

The present disclosure is not limited to the apparatus described in the present embodiment. For example, the terminal control software (program) that performs the functions of the above-described embodiment is supplied to the system or device via a network or various storage media. Then, a system or a control device of the device (for example, a CPU or the like) can read and execute the program.

For example, the eye examination program is an eye examination device that objectively measures the optical refractive power of the eye to be inspected by a photorefraction method, and has a plurality of measurement light sources arranged in the meridian direction with respect to the center of the optical axis. , A light projecting optical system that irradiates the fundus of the eye to be examined with the measurement light emitted from a plurality of measurement light sources, and a light receiving optical system that detects the reflected light of the measurement light reflected by the fundus of the eye to be examined by a detector. In an eye examination device including a light source control means for sequentially lighting the measurement light sources of the above, and a control means for acquiring the first optical power of the eye to be inspected based on the detection results of reflected light of a plurality of measurement light sources that are sequentially turned on. It may be the eye examination program used. In this case, for example, the optometry program is executed by the processor of the optometry device to obtain the second optical power of the eye to be inspected based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources. The optometry apparatus may be made to perform an output step of acquiring and outputting the second eye refractive power as the eye refractive power of the eye to be inspected.

<Example>
Hereinafter, the configuration of the optometry apparatus in this embodiment will be described. For example, FIG. 1 is a diagram illustrating a configuration of an optometry apparatus. In this embodiment, in the measurement of the left and right eyes to be inspected, a configuration in which the light projecting optical system and the light receiving optical system are shared by the left and right eyes to be inspected will be described as an example. That is, a case where the measurement of the left and right eyes to be inspected is performed by one light projecting optical system and one light receiving optical system will be described as an example.

For example, the eye examination device 1 objectively measures the refractive power of the eye to be inspected by a photorefraction method. For example, in the configuration of objectively measuring the optical power of the eye to be inspected by the photorefraction method, the optical power of the eye to be inspected is objectively measured from the ratio of the reflected light from the fundus of the eye to be inspected in the pupil. The configuration is shown. For example, in this embodiment, the optometry device 1 includes a housing 2. For example, the housing 2 houses an optical system (for example, a light projecting optical system 10 and a light receiving optical system 20) for objectively measuring the optical refractive power of the eye to be inspected by a photorefraction method. ing.

For example, the optometry device 1 includes a light projecting optical system 10 and a light receiving optical system 20. In the present embodiment, for example, the floodlight optical system 10 includes a measurement light source 13. Of course, for example, the floodlight optical system 10 may be composed of only the measurement light source 13. For example, the light receiving optical system 20 includes a detector 21 (for example, a CCD or the like) and a light receiving objective optical system 25.

For example, the presentation window 3 transmits the measurement light emitted from the measurement light source 13 in the projection optical system 10. Therefore, the eye E to be inspected is irradiated with the measurement light through the presentation window 3. For example, the presentation window 3 is closed with a transparent panel to prevent dust and the like from entering. For example, as the transparent panel, a transparent member such as an acrylic resin or a glass plate can be used.

FIG. 2 shows a view when the measurement light source 13 is viewed from the front direction (optical axis direction) (when the subject looks at the measurement light source 13). For example, as the measurement light source 13, a red LED (light emitting diode) that emits near infrared light is used. Of course, different types of light sources may be used.

For example, in this embodiment, the measurement light source 13 also serves as a light source for illuminating the anterior segment of the eye to be inspected. Of course, a dedicated light source for illuminating the anterior segment of the eye may be provided separately to illuminate the image of the anterior segment of the eye. Further, for example, in the present embodiment, the detector 21 also serves as a detector that captures an image of the anterior eye portion illuminated by the light source for illuminating the anterior eye portion. Of course, a dedicated detector for capturing the image of the anterior segment of the eye may be provided separately. For example, the captured front eye image is displayed on the display 11.

For example, in this embodiment, the measurement light source 13 also serves as a fixation lamp for fixing the eye to be inspected. Of course, a dedicated fixation lamp for fixing the eye to be inspected may be separately provided. For example, when the fixation lamp is provided, it may be provided on the optical axis or may be provided around the optical axis.

For example, as the measurement light source 13, a plurality of measurement light sources may be provided, and the measurement light sources may be arranged so as to be separated from each other in at least three meridian directions. Of course, the meridian direction in which the measurement light source is arranged can be any number of meridian directions (for example, 1 meridian direction, 2 meridian direction, 4 meridian direction, etc.). In this embodiment, a case where the measurement light sources are arranged in the four meridian directions will be described as an example. Further, in this embodiment, the case where the measurement light sources 13 are sequentially arranged on a virtual straight line extending in the meridian direction with respect to the center of the optical axis will be described as an example.

In this embodiment, a configuration in which two sets of measurement light sources are symmetrically arranged with respect to the optical axis center O1 of the objective lens 26 in one meridian direction will be described as an example. Of course, in the one meridian direction, the measurement light source may not be arranged as a control with the optical axis center O1 of the objective lens 26 as a reference. That is, the measurement light source may be arranged on only one side with respect to the optical axis center O1 of the objective lens 26 in the one meridian direction. In this embodiment, for example, as the measurement light source 13, eight sets of measurement light sources (measurement light source 13a, measurement light source 13b, measurement light source 13c, measurement light source 13d, measurement light source 13e, measurement light source 13f, measurement light source 13g) are used in the four meridian directions. , Measurement light source 13h) is arranged.

For example, eight sets of measurement light sources 13a to 13h are arranged concentrically on the outside of the outer peripheral circle of the objective lens 26 at intervals of 45 °. Of course, the arrangement position of each measurement light source can be arranged at any position. For example, the measurement light source 13 is fixed to the base 14. Further, for example, the objective lens 26 is fixed to the base 14.

For example, each of the eight sets of measurement light sources 13a to 13h has three measurement light sources. For example, the three light sources (for example, the three light sources 13a1, 13a2, 13a3 in the measurement light source 13a) are arranged in order with a predetermined interval in the longitudinal direction (radial direction) with respect to the optical axis center O1 of the objective lens 26. Has been done. For example, each measurement light source can be controlled independently. For example, lighting of each measurement light source, adjustment of the amount of light, and the like can be controlled independently.

In this embodiment, for example, the measurement light source 13 is configured to have eight sets of measurement light sources, but the present invention is not limited to this. For example, the measurement light source 13 may have any set of measurement light sources (for example, 3 sets, 4 sets, 5 sets, 6 sets, etc.). In this embodiment, the eight sets of measurement light sources 13a to 13h each have a configuration having three measurement light sources as an example, but the present invention is not limited to this. Each set of measurement light sources can have any number of measurement light sources (eg, 2, 4, 5, etc.).

For example, the measurement light source 13 is arranged concentrically on the outside of the outer peripheral circle of the objective lens 26 as described above.

For example, the detector 21 has a conjugate relationship with the pupil of the eye to be inspected. For example, the output from the detector 21 is input to the control unit 80. In this embodiment, for example, the optical axis L2 of the light receiving optical system 20 and the optical axis L1 of the light projecting optical system 10 are coaxial.

In the above configuration, the measurement light emitted from the measurement light source 13 heads in the direction of the eye E to be inspected. For example, the measurement light is applied to the fundus of the eye E to be inspected through the presentation window 3. That is, the measurement light is applied to the eye E to be inspected along the optical axis L1 of the projection optical system 10. In this embodiment, the measurement light is applied to the left and right eyes to be inspected (left and right eyes).

For example, the measurement light applied to the fundus of the eye E to be inspected is reflected and scattered to emit the eye E to be inspected, and is condensed by the objective lens 26. The reflected light collected by the objective lens 26 is detected by the detector 21. In this embodiment, each reflected light reflected by the left and right eyes is detected by the detector 21.

In this embodiment, for example, in the measurement light source 13, each measurement light source is turned on in sequence. For example, the control unit 80 turns on the measurement light source 13a1. At this time, the other measurement light sources are turned off. For example, the measurement light emitted from the measurement light source 13a1 is applied to the eye E to be inspected, and the reflected light reflected by the eye E to be inspected is detected by the detector 21. For example, when the detection result by lighting the measurement light source 13a1 is acquired, the control unit 80 turns on the next measurement light source 13a2 and turns off the measurement light source 13a1 to acquire the detection result by turning on the measurement light source 13a2. For example, when the detection result by turning on the measurement light source 13a2 is acquired, the control unit 80 turns on the next measurement light source 13a3 and turns off the measurement light source 13a2, and acquires the detection result by turning on the measurement light source 13a3.

For example, when the detection results of the three light sources of the measurement light source 13a are acquired, the control unit 80 carries out the measurement by the next set of measurement light sources. For example, the control unit 80 acquires the detection results of the three light sources of the measurement light source 13b. In this case, the measurement light source 13b1 is turned on and the other measurement light sources are turned off. Next, in the same manner as the measurement of the measurement light source 13a described above, the detection results of each measurement light source are sequentially acquired. For example, when the detection results of the three light sources of the measurement light source 13a are acquired, the control unit 80 carries out the measurement by the next set of measurement light sources. For example, the control unit 80 sequentially performs measurements with each set of measurement light sources.

In this embodiment, the configuration in which the measurement light source is turned on as described above is given as an example, but the present invention is not limited to this. The order in which each measurement light source is turned on can be performed in any order.

Next, for example, the photorefraction method will be described. FIG. 3 is a diagram illustrating a photorefraction method. In this embodiment, for example, the control unit 80 detects the reflected light from the fundus of the eye passing through the pupil by the detector 21, detects the ratio of the bright crescent in the pupil in the radial dimension of the pupil to the pupil diameter, and detects the following. The ocular refractive power is obtained by Equation 1 (see, for example, Japanese Patent Application Laid-Open No. 2006-149501).

Here, R indicates the dimensional ratio (B / 2r) of the bright crescent K in the pupil to the pupil diameter. For example, B is the radial length of the bright Crescent K. For example, r is the radius of the pupil of the eye to be inspected. For example, A is the optical power of the eye to be inspected. For example, e is the distance from the end portion 26a of the objective lens 26 to the measurement light source 13 (in FIG. 3, the measurement light source 13a1 in the measurement light source 13 is illustrated). For example, L is the reciprocal of the separation distance (measurement distance) S between the eye to be inspected E and the objective lens 26 (L = 1 / S).

As described above, for example, the ratio R of the bright crescent B differs depending on the optical power A of the eye to be inspected, assuming that other conditions are constant. That is, the optical power A of the eye to be inspected is calculated by the following mathematical formula 2 from the ratio R of the bright crescent measured under certain conditions.

As described above, the optical refractive power of the eye to be inspected is calculated by the photorefraction method.

For example, in this embodiment, the arrangement of the light projecting optical system 10 and the light receiving optical system 20 in FIG. 1 can be arbitrary. As an example, for example, the light projecting optical system 10 and the light receiving optical system 20 may be separately arranged at different positions so that measurement can be performed on different optical axes. FIG. 4 is a diagram showing one of the transformation examples in the configuration of the optometry device 1. In FIG. 4, the light projecting optical system 40 and the light receiving optical system 50 are arranged at different positions inside the housing 2.

In FIG. 4, for example, the optometry apparatus 1 includes a light projecting optical system 40 and a light receiving optical system 50. In the present embodiment, for example, the floodlight optical system 40 includes a measurement light source 41. Of course, for example, the floodlight optical system 40 may be composed of only the measurement light source 41. For example, the light receiving optical system 50 includes a detector 51 and a light receiving objective optical system 53. Further, the optometry device 1 includes a half mirror 60. For example, the measurement light emitted from the measurement light source 41 is applied to the half mirror 60. For example, the measurement light applied to the half mirror 60 is reflected by the half mirror 60 in the direction of the eye E to be inspected. The measurement light reflected in the direction of the eye E to be inspected is irradiated to the fundus of the eye E to be inspected through the presentation window 3. That is, the measurement light is applied to the eye E to be inspected along the optical axis L1 of the projection optical system 40.

For example, the measurement light applied to the fundus of the eye E to be inspected is reflected and scattered to emit the eye E to be inspected, and is collected by the objective lens 52 through the half mirror 60. The reflected light collected by the objective lens 52 is detected by the detector 51.

<Control unit>
For example, FIG. 5 is a schematic configuration diagram of a control system in the optometry device 1. For example, a display (monitor) 11, a measurement light source 13, a detector 21, a controller 81, a non-volatile memory 82, and the like are connected to the control unit 80.

For example, the control unit 80 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU controls each member of the optometry device 1. For example, RAM temporarily stores various types of information. For example, the ROM stores various programs for controlling the operation of the optometry device 1. The control unit 80 may be composed of a plurality of control units (that is, a plurality of processors).

For example, the controller 81 is used when switching the display of the display 11 and disclosing the measurement by lighting the measurement light source 13. For example, the signal input from the controller 81 is input to the control unit 80 via the cable. In this embodiment, the signal from the controller 81 may be input to the control unit 80 via wireless communication such as infrared rays. For example, at least one of a mouse, a joystick, a keyboard, a touch panel, and the like may be used for the controller 81.

For example, in this embodiment, the controller 81 is provided in the housing 2. More specifically, the controller 81 is provided around the display 11. Of course, the controller 81 can be arranged at an arbitrary position, or may be provided in a configuration different from that of the housing 2.

For example, the display 11 may be a display mounted on the main body of the optometry device 1 or a display connected to the main body of the optometry device 1. A display of a personal computer (hereinafter referred to as "PC") may be used. A plurality of displays may be used together. Further, the display 11 may be a touch panel. When the display 11 is a touch panel, the display 11 functions as a controller. An image of the eye to be inspected is displayed on the display 11.

For example, the non-volatile memory 82 is a non-transient storage medium capable of retaining the stored contents even when the power supply is cut off. For example, as the non-volatile memory (hereinafter referred to as memory) 82, a hard disk drive, a flash ROM, a USB memory, or the like can be used. For example, the memory 82 stores a measurement processing program.

<Control operation>
The optometry operation of the optometry device 1 having the above configuration will be described. In this embodiment, the left and right eyes are measured at the same time. Of course, the left and right eye measurements may be performed at different timings. For example, after the measurement of one eye to be inspected is completed, the measurement of the other eye to be inspected may be started.

For example, in this embodiment, the control unit 80 switches the measurement process based on the measurement time. For example, the control unit 80 switches between the first measurement process and the second measurement process based on the measurement time. For example, the first measurement process is a measurement process in which the first eye refractive power of the eye to be inspected is acquired based on the detection result of the reflected light of the measurement light source 13 that is sequentially turned on, and is output as the eye refractive power of the eye to be inspected. .. Further, for example, in the second measurement process, the second eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the predetermined measurement light source among the measurement light sources 13, and the second eye refractive power is applied. This is a measurement process that outputs as the optical power of the eye examination. In this embodiment, the left and right eyes are simultaneously irradiated with the measurement light, and the reflected light is detected at the same time.

For example, each measurement process may be associated with a mode (for example, the first measurement process is associated with the normal measurement mode and the second measurement process is associated with the simple measurement mode) and stored in the memory 82. Hereinafter, in this embodiment, a case where the measurement process is associated with the mode will be described as an example. In this embodiment, a configuration in which the measurement mode is automatically switched between the normal measurement mode and the simple measurement mode based on the measurement time is given as an example, but the present invention is not limited to this. For example, the switching of the measurement mode may be performed manually by the examiner. In this case, the controller 81 may be used to input a signal for switching the measurement mode to the control unit 80.

For example, FIG. 6 is a diagram showing a flowchart illustrating an inspection flow of the inspection device 1 using the measurement mode switching in this embodiment. First, the control unit 80 measures the first eye refractive power in the normal measurement mode (S1).

For example, the examiner instructs the examinee to observe the measurement light source 13 of the optometry apparatus 1. For example, the measurement light source 13 illuminates the anterior eye portion including the pupil of the subject, and the anterior eye portion image illuminated by the measurement light source 13 is detected by the detector 21. For example, the control unit 80 displays the front eye image detected by the detector 21 on the display 11. For example, the examiner adjusts the position of the eye examination device 1 so that the left and right eyes of the examinee are displayed on the display 11 of the eye examination device 1. For example, the control unit 80 may display on the display 11 that the alignment is completed when the left and right eyes of the subject are displayed on the display 11. Of course, the examiner may confirm that the left and right eyes of the examinee are displayed on the display 11 of the eye examination device 1 and recognize that the alignment is completed.

For example, when the alignment is complete, the examiner operates the controller 81 to select a switch to start the measurement. For example, the control unit 80 emits a measurement start trigger signal (hereinafter, referred to as a trigger signal) for starting measurement based on the output of the operation signal from the controller 81. For example, when a trigger signal for starting the measurement is emitted, the control unit 80 emits the measurement light from the measurement light source 13 of the projection optical system 10. For example, the measurement light emitted from the measurement light source 13 is projected onto the fundus of the eye E to be inspected. In this embodiment, the measurement light is applied to the fundus of the left and right eyes, respectively. The reflected light of the measurement light reflected from the fundus is detected by the detector 21 of the light receiving optical system 20.

For example, in the normal measurement mode, the control unit 80 turns on each measurement light source of the measurement light source 13 in order, and detects the light reflected from the eye to be inspected by each measurement light source by the detector 21. For example, the output signal from the detector 21 is stored in the memory 82 as image data (measured image). In this embodiment, the image data of the left and right eyes are acquired, and the image data (measured images) of the left and right eyes are stored in the memory 82, respectively. After that, the control unit 80 analyzes the image stored in the memory 82 to obtain the value of the first eye refractive power of the left and right eyes.

This will be described in more detail. For example, in the normal measurement mode, the control unit 80 has spherical information (spherical surface) in the direction in which the measurement light source 13a is arranged, based on the detection result detected by lighting the measurement light sources 13a (three measurement light sources 13a1 to 13a3). Frequency) is calculated. For example, when the control unit 80 calculates spherical information in the direction in which the measurement light source 13a is arranged, the control unit 80 is based on at least one of the measurement results acquired by lighting the three measurement light sources 13a1 to 13a3. , Acquire spherical information in the arrangement direction of the measurement light source 13a. In this case, for example, the control unit 80 may acquire the average value of each spherical surface information acquired from each of the three measurement light sources 13a1 to 13a3 as spherical information in the arrangement direction of the measurement light source 13a. Further, in this case, for example, the control unit 80 may select one spherical surface information from the three measurement light sources 13a1 to 13a3 and acquire it as spherical information in the arrangement direction of the measurement light source 13a.

For example, when the spherical information in the arrangement direction of the measurement light source 13a is acquired as described above, the control unit 80 then performs the spherical information in each arrangement direction of the other measurement light sources 13b to 13h in the same manner as described above. Will be acquired respectively.

FIG. 7 is a diagram illustrating lighting of the measurement light source 13 in the normal measurement mode. In FIG. 7, among the measurement light sources (plurality of measurement light sources) 13, the measurement light source used in the normal measurement mode is hatched (filled). As shown in FIG. 7, as described above, each measurement light source in the measurement light source 13 is sequentially turned on, and as a result, all the light sources of the measurement light source 13 are turned on in order to perform measurement (all measurement light sources are hatched portions). ).

In this embodiment, the first spherical power, the first astigmatic power, and the first astigmatic axis angle are acquired as the first optical power. For example, when the spherical surface information in each direction is acquired, the control unit 80 acquires the first spherical surface frequency based on the spherical surface information in each direction. For example, the average value of the spherical powers acquired in each direction may be used as the first spherical power. Of course, the first spherical power may be configured to be acquired based on at least one or more spherical powers among the spherical powers in each direction. Further, for example, the control unit 80 acquires the first astigmatic power and the first astigmatic axis angle based on the spherical power (spherical power distribution) in each direction. That is, for example, the control unit 80 acquires the first optical power of S (spherical power), C (astigmatism power), and A (astigmatism axis angle) of the eye to be inspected. The obtained first eye refractive power is stored in the memory 82. In this embodiment, the first eye refractive powers of the left and right eyes are stored in the memory 82, respectively.

Here, for example, the control unit 80 switches the measurement mode based on whether or not a predetermined time has elapsed before acquiring the first optical power (S2). For example, the control unit 80 changes from the normal measurement mode to the simple measurement mode when a predetermined time elapses (for example, 10 seconds or the like) after starting the acquisition of the first eye refractive power in the normal measurement mode. To switch. Further, for example, the control unit 80 completes the measurement from the start of acquisition of the first eye refractive power in the normal measurement mode to the elapse of a predetermined time (for example, 10 seconds or the like) (first eye refractive power). When the measurement of (S3) is completed, the acquired first eye refractive power is output as the eye refractive power of the eye to be inspected (S3). In this embodiment, the control unit 80 displays the acquired optical power of the eye to be inspected on the display screen of the display 11. For example, the predetermined time may be set in advance to a time obtained by simulation, experiment, or the like, which can be determined to be difficult to measure. For example, the predetermined time may be configured to be arbitrarily set by the examiner.

In this embodiment, the normal measurement mode is changed to the simple measurement mode when a predetermined time has elapsed from the start of acquisition of the first eye refractive power for one of the left and right eyes to be inspected. And switch the measurement mode. Of course, for both eyes (left and right eyes), the measurement mode may be switched from the normal measurement mode to the simple measurement mode when a predetermined time has elapsed from the start of acquisition of the first eye refractive power. ..

For example, when the control unit 80 switches the measurement mode to the simple measurement mode, the eye to be inspected is based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources (measurement light source 13). (S4). In this embodiment, when the measurement mode is switched, the second eye refractive power is acquired for both the left and right eyes. Of course, for example, when a predetermined time has passed for one of the left and right eyes, the second eye refractive power is acquired only for the eye to be examined on the side where the predetermined time has passed. May be good.

This will be described in more detail. In this embodiment, the spherical power (hereinafter referred to as the second spherical power) is acquired as the second optical power. For example, in the simple measurement mode, the control unit 80 performs measurement with a predetermined measurement light source. For example, when acquiring the second spherical power, the control unit 80 selectively turns on a predetermined measurement light source. For example, in the simple measurement mode, the control unit 80 detects the light reflected from the eye to be inspected by a predetermined measurement light source by the detector 21. For example, the output signal from the detector 21 is stored in the memory 82 as image data (measured image). In this embodiment, the image data of the left and right eyes are acquired, and the image data of the left and right eyes are stored in the memory 82, respectively. After that, the control unit 80 analyzes the image stored in the memory 82 to obtain the value of the second spherical power of the left and right eyes.

For example, FIG. 8 is a diagram illustrating lighting of the measurement light source 13 in the simple measurement mode. In FIG. 8, among the measurement light sources (plurality of measurement light sources) 13, a predetermined measurement light source used in the simple measurement mode is hatched (filled). In this embodiment, the measurement light source 13a (three measurement light sources 13a1 to 13a3) is used as a predetermined light source for acquiring the second spherical power. For example, the control unit 80 sequentially turns on only the measurement light sources 13a (three measurement light sources 13a1 to 13a3). Of course, in the simple measurement mode, the measurement light source that is selectively turned on is not limited to the measurement light source 13a. Any measurement light source can be set.

For example, the control unit 80 may acquire the average value of each spherical surface information acquired from each of the three measurement light sources 13a1 to 13a3 as the second eye refractive power. Further, in this case, for example, the control unit 80 may select one spherical information from the three measurement light sources 13a1 to 13a3 and acquire it as the second spherical power. For example, the control unit 80 outputs the acquired second spherical powers of the left and right eyes as the optical refractive power of the eye to be inspected (S5). In this embodiment, the control unit 80 displays the acquired optical power of the eye to be inspected on the display screen of the display 11.

As described above, for example, in the eye examination device of the present embodiment, the control means acquires the second optical power of the eye to be inspected based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources. Then, the second eye refractive power is output as the eye refractive power of the eye to be inspected. For example, with such a configuration, the measurement can be completed smoothly without spending time.
Further, for example, in the present embodiment, the first measurement that acquires the first eye refractive power of the eye to be inspected based on the detection results of the reflected light of a plurality of measurement light sources that are sequentially turned on and outputs it as the optical power of the eye to be inspected. The second eye refractive power of the eye to be inspected is acquired based on the processing (normal measurement mode) and the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources, and the second eye refractive power is set to the eye to be inspected. A second measurement process (simple measurement mode) that outputs as an optical power of the eye and a measurement process switching means for switching the measurement process may be provided. With such a configuration, for example, in a photorefraction type optometry device, even if the eye to be inspected cannot be measured satisfactorily and the measurement takes a long time, the measurement result can be obtained smoothly and easily. can.

Further, for example, in the present embodiment, the measurement processing switching means performs measurement processing from the first measurement processing (normal measurement mode) to the second measurement processing (simple measurement mode) when the measurement of the eye to be inspected elapses for a predetermined time. (Switching of measurement mode) may be performed. With such a configuration, for example, in a photorefraction type optometry apparatus, it is possible to switch the measurement process from the first measurement process to the second measurement process based on the passage of the measurement time, so that complicated processing is not required and it is easy. With the configuration, the measurement can be completed smoothly.

Further, for example, in the second measurement process (simple measurement mode) in the present embodiment, the predetermined measurement light source is at least one measurement light source arranged in one meridian direction with respect to the center of the optical axis. Only the spherical power may be acquired as the second refraction force of the second eye based on the reflected light of the measurement light by at least one measurement light source. With such a configuration, for example, by using only a plurality of measurement light sources arranged in at least one meridian direction, it is possible to obtain a spherical power more smoothly and accurately.

In this embodiment, the measurement mode is switched based on the passage of the measurement time, but the present invention is not limited to this. When the quality of the measurement of the eye to be inspected in the normal measurement mode is judged and it is judged that the measurement of the eye to be inspected in the normal measurement mode is not good, the measurement mode may be switched from the normal measurement mode to the simple measurement mode. .. With such a configuration, for example, in a photorefraction type optometry device, it is determined whether or not the measurement is good or bad in the normal measurement mode, and when the measurement is not good, the measurement can be performed more easily to the simple measurement mode. By switching the processing, it is possible to complete the measurement more smoothly even for the eye to be inspected, which cannot be measured well in the normal measurement mode.

In this embodiment, when it is determined that the measurement of the eye to be inspected in the normal measurement mode is not good for one of the left and right eyes, the measurement mode is switched from the normal measurement mode to the simple measurement mode. It may be. Of course, when it is determined that the measurement of the eye to be inspected in the normal measurement mode is not good for both eyes, the measurement mode may be switched from the normal measurement mode to the simple measurement mode. For example, when the measurement mode is switched, the second eye refractive power may be acquired for both the left and right eyes. Of course, for example, when it is determined that the measurement of the eye to be inspected is not good for one of the left and right eyes, the second eye refractive power is obtained only for the eye to be inspected which is judged to be not good in the measurement of the eye to be inspected. May be obtained.

<Example of transformation>
In this embodiment, for example, an optical power to be output as an optical power of the eye to be inspected may be newly acquired based on the optical power of the eye to be inspected. In the present embodiment, for example, the control unit 80 selects the second measurement light source from among the plurality of measurement light sources based on whether or not the second eye refractive power (absolute value of the second eye refractive power) satisfies a predetermined criterion. The third eye refractive power of the test eye is acquired based on the reflected light of the measurement light from the measurement light source different from the measurement light source used for acquiring the eye refractive power, and the third eye refractive power is set to the eye refractive power of the test eye. It may be output as. In this embodiment, for example, a case where a predetermined optical power is used as a predetermined reference will be described as an example.

Here, for example, when the optical power of the eye to be measured has a low diopter, the inventors can obtain an accurate measurement result by using a measurement light source near the center of the optical axis and perform measurement. It has been found that when the optical power of the eye to be inspected is high diopter, accurate measurement results can be obtained by using a measurement light source far from the center of the optical axis.

In this embodiment, the spherical power (hereinafter referred to as the second spherical power) will be described as an example of the second optical power. Of course, the astigmatic power may be included. Further, in this embodiment, for example, as the second spherical power, a case where the spherical power has a lower diopter than the spherical power in the third optical power (hereinafter referred to as the third spherical power) is given as an example. I will explain.

In this embodiment, the second spherical power, which is the second-eye refractive power, is a lower diopter than the third spherical power, which is the third-eye refractive power. Therefore, when acquiring the second spherical power, it is possible to obtain an accurate measurement result by using a measurement light source close to the center of the optical axis. Further, when acquiring the third spherical power, a measurement light source far from the center of the optical axis (at least a measurement light source farther from the center of the optical axis than the measurement light source used when acquiring the second spherical power) is used. By using it, accurate measurement results can be obtained. Of course, even when the second-eye refractive power and the third-eye refractive power include the astigmatic power, the same idea as the spherical power can be applied.

FIG. 9 is a diagram illustrating an optometry flow of a modified example. For example, the predetermined measurement light source used to acquire the second eye refractive power is located closer to the center of the optical axis in the meridian direction than the different measurement light sources used to acquire the third eye refractive power. Is located in.

In this embodiment, the second spherical power is acquired as a pre-measurement. Further, as the main measurement, the third spherical power is acquired. For example, each measurement may be associated with a mode (for example, the pre-measurement is associated with the pre-measurement mode and the main measurement is associated with the main measurement mode) and stored in the memory 82. Hereinafter, in this embodiment, a case where each measurement is associated with a mode will be described as an example. In this embodiment, for example, the mode is switched to the main measurement mode in which the third spherical power is acquired based on the second spherical power acquired in the pre-measurement mode. Of course, for example, the switching of the measurement mode may be performed manually by the examiner. In this case, the controller 81 may be used to input a signal for switching the measurement mode to the control unit 80.

First, the control unit 80 performs a pre-measurement to acquire the second spherical power (S11). For example, when the alignment is complete, the examiner operates the controller 81 to select a switch to start the measurement. For example, the control unit 80 emits a measurement start trigger signal (hereinafter, referred to as a trigger signal) for starting measurement based on the output of the operation signal from the controller 81. For example, when a trigger signal for starting the measurement is emitted, the control unit 80 emits the measurement light from the measurement light source 13 of the projection optical system 10. For example, the measurement light emitted from the measurement light source 13 is projected onto the fundus of the eye E to be inspected. In this embodiment, the measurement light is applied to the fundus of the left and right eyes, respectively. The reflected light of the measurement light reflected from the fundus is detected by the detector 21 of the light receiving optical system 20.

For example, in the pre-measurement mode, the control unit 80 acquires the second spherical power of the eye to be inspected based on the reflected light of the measurement light by the predetermined measurement light source among the plurality of measurement light sources (measurement light source 13). This will be described in more detail. For example, in the pre-measurement mode, the control unit 80 performs measurement with a predetermined measurement light source. For example, when acquiring the second spherical power, the control unit 80 selectively turns on a predetermined measurement light source. For example, in the pre-measurement mode, the control unit 80 detects the light reflected from the eye to be inspected by a predetermined measurement light source by the detector 21. For example, the output signal from the detector 21 is stored in the memory 82 as image data (measured image). In this embodiment, the image data of the left and right eyes are acquired, and the image data (measured images) of the left and right eyes are stored in the memory 82, respectively. After that, the control unit 80 analyzes the image stored in the memory 82 to obtain the value of the second spherical power of the left and right eyes.

For example, FIG. 10 is a diagram illustrating lighting of the measurement light source 13 in the pre-measurement mode. In FIG. 10, among the measurement light sources (plurality of measurement light sources) 13, a predetermined measurement light source used in the pre-measurement mode is hatched (filled). In this embodiment, as a predetermined light source for acquiring the second spherical power, among a plurality of measurement light sources 13a to 13h arranged in each meridian direction, they are arranged at a position closest to the optical axis in each meridian direction. Only the measurement light sources (8 measurement light sources 13a1, 13b1, 13c1, 13d1, 13e1, 13f1, 13g1, 13h1) are selectively turned on to measure the second spherical power. For example, the control unit 80 turns on only the eight measurement light sources 13a1 to 13h1 in sequence. Of course, in the pre-measurement mode, the measurement light sources that are selectively turned on are not limited to the eight measurement light sources 13a1 to 13h1. Any measurement light source can be set.

For example, the control unit 80 may acquire the average value of each spherical surface information acquired from each of the eight measurement light sources 13a1 to 13h1 as the second spherical power. That is, the second spherical power may be obtained based on the spherical information in different meridian directions. Further, in this case, for example, the control unit 80 may select one spherical information from the eight measurement light sources 13a1 to 13h1 and acquire it as the second spherical power. The obtained second spherical power is stored in the memory 82. In this embodiment, the second spherical powers of the left and right eyes are stored in the memory 82, respectively.

Here, for example, the control unit 80 switches the measurement mode based on whether or not the second spherical power satisfies a predetermined optical power (in this embodiment, a predetermined spherical power) (S12). In this embodiment, for example, with respect to the configuration of whether or not a predetermined eye refractive power is satisfied, the third eye refractive power is acquired based on whether or not the second spherical power is larger than the predetermined eye refractive power. The configuration to be performed will be described as an example.

For example, in the pre-measurement mode, the control unit 80 has acquired a second spherical power larger than a predetermined spherical power (for example, greater than −3.0D or greater than + 3.0D (from an absolute value of 3.0). Large) etc.) When the spherical power is high diopter, the measurement mode is switched from the pre-measurement mode to the main measurement mode. Further, for example, in the pre-measurement mode, the acquired second spherical power is a low diopter of a predetermined spherical power or less (for example, −3.0D or less, or + 3.0D or less (absolute value 3.0 or less), etc.). In the case of the spherical power of −, the second spherical power acquired by the pre-measurement mode is output as the optical refractive power of the eye to be inspected (S13). In this embodiment, the control unit 80 displays the acquired optical power of the eye to be inspected on the display screen of the display 11. For example, the predetermined spherical power may be set in advance to a value (spherical power) at which the spherical power of the eye to be inspected can be accurately obtained by simulation, experiment, or the like. For example, the predetermined spherical power may be configured to be arbitrarily set by the examiner.

In this embodiment, the pre-measurement mode is performed when the acquired second spherical power of one of the left and right eyes is a high diopter spherical power larger than the predetermined spherical power. Switches the measurement mode from to this measurement mode. Of course, for both eyes, if the acquired second spherical power is a high diopter spherical power larger than the predetermined spherical power, the measurement mode may be switched from the pre-measurement mode to the main measurement mode. good.

For example, the control unit 80 uses a predetermined measurement light source (in this embodiment, eight measurement light sources 13a1) used when acquiring the second spherical power when the main measurement mode is switched to the pre-measurement mode. The third spherical power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from ~ 13h1) (S14). In this embodiment, when the measurement mode is switched, the third spherical power is acquired for both the left and right eyes. Of course, for example, when the acquired second spherical power of one of the left and right eyes is a high diopter spherical power larger than the predetermined spherical power, the acquired second spherical power is The third spherical power may be acquired only for the eye to be inspected on the side having the spherical power of a high diopter larger than the predetermined spherical power.

This will be described in more detail. For example, in this measurement mode, the control unit 80 uses all the measurement light sources arranged in the optometry device 1 as different measurement light sources for acquiring the third spherical power (see FIG. 7). That is, in this embodiment, the same measurement processing is performed for the normal measurement mode for acquiring the first eye refractive power and the main measurement mode for acquiring the third eye refractive power. For example, the control unit 80 turns on each measurement light source of the measurement light source 13 in order, and detects the light reflected from the eye to be inspected by each measurement light source by the detector 21. For example, the output signal from the detector 21 is stored in the memory 82 as image data (measured image). In this embodiment, the image data of the left and right eyes are acquired, and the image data of the left and right eyes are stored in the memory 82, respectively. After that, the control unit 80 analyzes the image stored in the memory 82 to obtain the value of the third spherical power of the left and right eyes.

For example, the control unit 80 may acquire the average value of each spherical surface information acquired from each set of measurement light sources (for example, three measurement light sources 13a1 to 13a3) as spherical information in the arrangement direction of the measurement light source 13a. .. Further, in this case, for example, the control unit 80 may select one spherical surface information from the three measurement light sources 13a1 to 13a3 and acquire it as spherical information in the arrangement direction of the measurement light source 13a. For example, when the spherical surface information in each direction is acquired, the control unit 80 acquires the third spherical power based on the spherical surface information in each direction. As an example, for example, the average value of the spherical powers in each direction may be used as the third spherical power. Of course, the third spherical power may be configured to be acquired based on at least one or more spherical powers among the spherical powers in each direction.

In this measurement mode, a configuration using all the measurement light sources arranged in the optometry device 1 is given as an example, but the present invention is not limited to this. For example, in this measurement mode, the eye to be inspected is based on the reflected light of the measurement light by a measurement light source different from the measurement light source used when acquiring the second eye refractive power (in this embodiment, the second spherical power). The configuration may be such that the third eye refractive power (in this embodiment, the third spherical power) is acquired. As an example, as shown in FIG. 11, among a plurality of measurement light sources arranged in each meridian direction, measurement light sources (eight measurement light sources 13a3, 13b3) arranged at the position farthest from the optical axis in each meridian direction. , 13c3, 13d3, 13e3, 13f3, 13g3, 13h3) may be selectively lit (see the hatched portion of FIG. 11) so that the third eye refractive force can be measured.

For example, the control unit 80 outputs the acquired third spherical powers of the left and right eyes as the optical refractive power of the eye to be inspected (S15). In this embodiment, the control unit 80 displays the acquired optical power of the eye to be inspected on the display screen of the display 11.

As described above, in this embodiment, it is used when acquiring the second eye refractive power from a plurality of measurement light sources based on whether or not the second eye refractive power is larger than a predetermined eye refractive power. The third eye refractive power of the eye to be inspected may be acquired based on the reflected light of the measurement light from the measurement light source different from the measurement light source, and the third eye refractive power may be output as the eye refractive power of the eye to be inspected. As a result, the measurement light source used for acquiring the optical power can be selected according to the optical power of the eye to be inspected, so that the measurement can be smoothly completed for the eye to be inspected with various optical powers. At the same time, more accurate measurement results can be obtained.

Further, for example, in the present embodiment, the second eye refractive power is lower than the third eye refractive power, and the predetermined measurement light source used for acquiring the second eye refractive power is the first. It may be arranged at a position closer to the center of the optical axis in the meridian direction than the different measurement light sources used to acquire the three-eye refractive power. Thus, for example, the predetermined measurement light source used to obtain the second eye refractive power has an optical axis in the meridian direction than the different measurement light sources used to obtain the third eye refractive power. By being placed near the center, when the second eye refractive power is lower than the third eye refractive power, the measurement is smoothly completed for the eyes under test with various optical powers. At the same time, more accurate measurement results can be obtained.

In this embodiment, a configuration for switching from the pre-measurement mode to the main measurement mode based on the second eye refractive power acquired in the pre-measurement mode has been described as an example, but the present invention is not limited to this. For example, the measurement mode is switched based on the ratio of the reflected light from the fundus of the eye to be examined in the pupil (for example, the dimensional ratio of bright crescent K in the pupil to the pupil diameter described later (B / 2r)). May be good. For example, the control unit 80 may switch from the pre-measurement mode to the main measurement mode based on whether or not the ratio of the light reflected from the fundus of the eye to be inspected in the pupil satisfies a predetermined criterion.

As the configuration of whether or not the predetermined criteria are satisfied, the configuration of whether or not the predetermined ratio is satisfied may be used. In this case, for example, the control unit 80 switches from the pre-measurement mode to the main measurement mode based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil satisfies a predetermined ratio. May be good. As an example, for example, the control unit 80 from the pre-measurement mode is based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil is within a predetermined ratio of 0.1 to 0.9. You may switch to this measurement mode. In this case, for example, when the ratio of the reflected light from the fundus of the eye to be examined in the pupil is out of the predetermined ratio range of 0.1 to 0.9, for example, the control unit 80 makes the main measurement from the pre-measurement mode. You may want to switch to the mode.

As described above, for example, the control means switches from the pre-measurement mode to the main measurement mode based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil satisfies a predetermined ratio. You may. With such a configuration, the measurement light source used for acquiring the optical power can be selected according to the optical power of the eye to be inspected, so that the measurement can be smoothly performed on the eye to be inspected with various optical powers. It can be completed and more accurate measurement results can be obtained.

In this embodiment, the pre-measurement mode is changed to the main measurement mode when the ratio of the light reflected from the fundus of the eye to be inspected in the pupil of one of the left and right eyes does not satisfy a predetermined ratio. And the measurement mode may be switched. Of course, for both eyes, the measurement mode may be switched from the pre-measurement mode to the main measurement mode when the ratio of the light reflected from the fundus of the eye to be examined in the pupil does not satisfy a predetermined ratio.

For example, the control unit 80 may acquire the third spherical power for both the left and right eyes when the main measurement mode is switched to the pre-measurement mode. Of course, for example, when the ratio of the light reflected from the fundus of the eye to be examined in the pupil does not satisfy a predetermined ratio for one of the left and right eyes, the ratio of the light reflected from the fundus of the eye to be examined in the pupil. The third spherical power may be acquired only for the eye to be inspected on the side that does not satisfy the predetermined ratio.

1 Eye inspection device 2 Housing 3 Presentation window 10 Floodlight optical system 11 Display 13 Measurement light source 14 Base 20 Light receiving optical system 21 Detector 25 Light receiving objective optical system 26 Objective lens 40 Light emitting optical system 41 Measuring light source 50 Light receiving optical system 51 Detection Instrument 52 Objective lens 53 Optical system for light reception 60 Half mirror 80 Control unit 81 Controller 82 Non-volatile memory

Claims (10)

An optometry device that objectively measures the refractive power of the eye to be inspected by the photorefraction method.
A projection optical system having a plurality of measurement light sources arranged in the longitudinal direction with respect to the center of the optical axis and irradiating the fundus of the eye to be inspected with measurement light emitted from the plurality of measurement light sources.
A light receiving optical system that detects the reflected light of the measurement light reflected by the fundus of the eye to be inspected by a detector, and a light receiving optical system.
A light source control means for sequentially lighting the plurality of measurement light sources, and
A control means for acquiring the first-eye refractive power of the eye to be inspected based on the detection results of the reflected light of the plurality of measurement light sources that are sequentially turned on.
With
The control means acquires the second eye refractive power of the eye to be inspected based on the reflected light of the measurement light by a predetermined measurement light source among the plurality of measurement light sources, and applies the second eye refractive power to the subject. An optometry device characterized by outputting as an optical power of optometry. In the optometry apparatus of claim 1,
The first measurement process of acquiring the first eye refractive power of the eye to be inspected based on the detection results of the reflected light of the plurality of measurement light sources that are sequentially turned on and outputting it as the eye refractive power of the eye to be inspected.
Among the plurality of measurement light sources, the second eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the predetermined measurement light source, and the second eye refractive power is applied to the eye of the eye to be inspected. The second measurement process that outputs as refractive power,
An optometry apparatus comprising a measurement process switching means for switching the measurement process of the above. In the optometry apparatus of claim 2,
When the measurement process switching means determines the quality of the measurement of the eye to be inspected in the first measurement process and determines that the measurement of the eye to be inspected in the first measurement process is not good, the first measurement process is performed. An optometry apparatus characterized in that the measurement process is switched to the second measurement process. In the optometry apparatus of claim 3,
The measurement process switching means determines whether or not the measurement of the eye to be inspected in the first measurement process is completed when a predetermined time has elapsed, and the measurement of the eye to be inspected in the first measurement process is predetermined. If it is not completed even after the lapse of time, it is determined that the measurement of the eye to be inspected in the first measurement process is not good, and the measurement process is switched from the first measurement process to the second measurement process. An eye examination device characterized in that. In the optometry apparatus of claim 2,
The measurement process switching means is an eye examination device that switches the measurement process from the first measurement process to the second measurement process when the measurement of the eye to be inspected elapses for a predetermined time. In the optometry apparatus according to any one of claims 2 to 5.
In the second measurement process, the predetermined measurement light source is at least one measurement light source arranged in one meridian direction with respect to the center of the optical axis, and the reflected light of the measurement light by the at least one measurement light source. An eye examination device characterized in that only the spherical power is acquired as the second eye refractive power based on the above. In the optometry apparatus of claim 1,
The control means is a measurement light source used when acquiring the second eye refractive power from the plurality of measurement light sources based on whether or not the second eye refractive power satisfies a predetermined criterion. An eye examination device characterized in that the third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by different measurement light sources, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. In the optometry apparatus of claim 1,
When the control means acquires the second eye refractive power from the plurality of measurement light sources based on whether or not the ratio of the reflected light from the fundus of the eye to be inspected in the pupil satisfies a predetermined criterion. The third eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by the measurement light source different from the measurement light source used in the above, and the third eye refractive power is output as the eye refractive power of the eye to be inspected. An eye examination device characterized by. In the optometry device of claim 7 or 8.
The second eye refractive power is a lower diopter than the third eye refractive power.
The predetermined measurement light source used to acquire the second eye refractive power is more centered on the optical axis in the meridian direction than the different measurement light sources used to acquire the third eye refractive power. An optometry device characterized by being arranged at a position close to. An optometry device that objectively measures the refractive power of the eye to be inspected by the photorefraction method.
A projection optical system having a plurality of measurement light sources arranged in the longitudinal direction with respect to the center of the optical axis and irradiating the fundus of the eye to be inspected with measurement light emitted from the plurality of measurement light sources.
A light receiving optical system that detects the reflected light of the measurement light reflected by the fundus of the eye to be inspected by a detector, and a light receiving optical system.
A light source control means for sequentially lighting the plurality of measurement light sources, and
A control means for acquiring the first-eye refractive power of the eye to be inspected based on the detection results of the reflected light of the plurality of measurement light sources that are sequentially turned on.
An optometry program used in an optometry device comprising
By being executed by the processor of the optometry device,
Among a plurality of measurement light sources, the second eye refractive power of the eye to be inspected is acquired based on the reflected light of the measurement light by a predetermined measurement light source, and the second eye refractive power is used as the eye refractive power of the eye to be inspected. Output Output step to output and
An optometry program, characterized in that the optometry apparatus is executed.

Images