JPH09182722A - Ophthalmic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an ordinary subject to easily understand his/her own sight condition by relating measurement data of a near point meter to those of an objective perimetry ocular refraction measuring device or a lens meter. SOLUTION: An adjustment limit of tested eyes at near distance is measured with the near point measuring means of a near point meter 1. Objective perimetry value information and glass value information related to the ocular refraction of tested eyes are measured with an objective perimetry ocular refraction measuring device 30 and a lens meter 33, and the information is inputted via an IC card 32. An input control circuit 40 obtains a far point distance of tested eyes based on the input information related to the ocular refraction of eyes tested, then creates a picture of visual field of tested eyes based on the far point distance and the near point distance of the near point measuring means, and print it out from a printer 24.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus, and more particularly to an ophthalmologic apparatus capable of easily showing the state of the clear visual zone of an eye to be examined.

[0003]

[0002]

[0004]

2. Description of the Related Art The extent to which a human eye can see, that is, the distance at which adjustment is possible at a near distance can be known by using a so-called near point meter. This device measures the position by moving the measurement target to be gazed at the eye to be examined from the distant direction toward the subject and causing the subject to respond to the position where the measurement target cannot be seen clearly. .

In order to know the refractive power of the human eye, an automated objective eye refractive power measuring device is often used at present. With this device, it is possible to objectively measure and know the refracting power of the eye in a state in which accommodation is stopped.

[0006] In the case of a person who has eyeglasses with refractive error and wears eyeglasses to correct it, the refractive power of the eyeglass lens can be known by measuring with a lens meter.

[0007]

[0003]

[0008]

By the way, the measurement result of the refractive power obtained by the objective type eye refractive power measuring device or the lens meter is usually a diopter (D: focal length represented by a meter). The unit of reciprocal number) is used, and it is difficult for a subject who lacks specialized knowledge to understand what the numerical value means.

Further, a near point meter or an objective type eye refractive power measuring device,
The measurement results obtained by the lens meter are only shown individually, and for the general subject, the relationship between these measurement results makes it possible to fully understand what kind of state the self's eye looks like. It wasn't something.

In view of the above-mentioned prior art, the present invention associates the measurement data by the near-point meter with the measurement data by the objective eye refractive power measuring device or the lens meter, so that even a general subject can It is a technical object to provide an ophthalmologic apparatus capable of showing the state of appearance of one's eyes in an easy-to-understand manner.

[0011]

[0004]

[0012]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following arrangement. (1) In an ophthalmologic apparatus having a near point measuring means for measuring the accommodation limit of the eye to be examined at a near distance, an input means for inputting information on the refractive power of the eye to be examined, and the refractive power of the eye to be examined by the input means. A far point distance calculating means for obtaining a far point distance of the eye to be inspected based on the information on the eye, and a far point distance obtained by the far point distance calculating means and a near point distance by the near point measuring means It is characterized in that it is provided with a drawing creating means for creating a drawing in the clear viewing zone state and a drawing output means for outputting the drawing by the drawing creating means.

[0013]

(2) The information on the refractive power of the eye to be examined, which is input in (1), is the objective refractive power information obtained by objectively measuring the eye to be examined and the refractive power of the spectacle lens worn by the subject. It is characterized in that it has the refractive power of spectacles.

[0014]

(3) The drawing creating means of (1) has a means for drawing and creating a target pattern that imitates a work target object used at a near distance, and has a clear visual field composed of a near point distance and a far point distance. It is characterized in that the clear visual area pattern shown is associated with the position of the target pattern and drawn.

[0015]

(4) The ophthalmologic apparatus of (3) is characterized in that it has a plurality of target symbols imitating a work target to be used at a near distance and has a selection means for selecting the target symbol.

[0016]

(5) The drawing creating means of (3) is further characterized by adding distance numerical values of the near point and the far point.

[0017]

(6) The far point distance calculating means of (1) has two types of a strong main radial line direction and a weak main radial line direction depending on the cylindrical surface refractive power from the objective refractive power information and the eyeglass refractive power information. It is characterized by calculating a far point.

[0018]

(7) In the ophthalmologic apparatus of (1), the far point distance calculating means, the drawing creating means and the drawing output means are integrally provided.

[0019]

[0011]

[0020]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view for explaining the external appearance of a near point meter 1 which constitutes the apparatus of the embodiment. The near point meter 1 moves the measurement target to be gazed at the eye to be examined from the distant direction toward the subject, and causes the subject to respond to the position where the measurement target cannot be seen clearly, thereby determining the near point distance. Measure. Reference numeral 3 is an optotype presenting unit for presenting a measurement optotype to the eye to be inspected, and the measurement optotypes 2a and 2b for the right eye gaze, the left eye gaze, and the binocular gaze are provided by lighting a lamp arranged inside the unit. 2c are presented individually. The optotype presenting unit 3 is moved back and forth by a moving mechanism including a pulse motor 7 and the like along two guide shafts 6 erected on columns 5a and 5b standing on the base 4. By the movement of the optotype presenting unit 3, the measurement optotype plane moves from an initial position of 40 cm to a distance of 5 cm with respect to the eye to be inspected, which is fixed to the head support portion 10 that supports the head of the subject. .

[0022]

The head supporting unit 10 is provided with an eye contact unit 11 for shielding the non-measurement eye and arranging a correction lens for the eye to be examined whose near point is far.
The eye contact unit 11 is provided with a ring window 12 through which the eye to be inspected, and a receiving portion for disposing a correction lens 13 is formed in the ring window 12. The correction lens 13 is +2.
Use 0D (diopter), and the inspection distance is 5.5
cm to 200 cm. When the non-measurement eye is shielded, the shield plate 14 is slid to the left and right and positioned in front of the ring window 12.

On the base 4, there are a forward / backward movement switch 20 for manually moving the optotype presenting unit, a response switch 21 for answering that the subject cannot see the measurement optotype, and various operation switch groups. Operation panel 2 provided
2. IC card reader / writer 2 that inputs and outputs data
3 and a printer 24 for drawing and printing (discussed later) and outputting the visual field of the eye to be inspected.

[0024]

FIG. 2 is a block diagram for explaining the structure of the apparatus.

Reference numeral 30 denotes an objective-type eye-refractive-power measuring device. The objective-type eye-refractive-power measuring device 30 projects a measurement index on the fundus of the eye to be examined, and detects a reflection index image from the fundus with a light receiving element. The refractive power of the eye to be examined is measured by. As the refractive power, the spherical power, the power of the cylindrical surface, and the objective value data of the astigmatic axis angle of each eye are obtained. The obtained objective value data is stored in the IC card 32 via the IC card writer 31.

Reference numeral 33 is a lens meter for measuring the refractive power of the spectacle lens. The lens meter 33 projects the index light beam for measurement onto the lens to be measured, and detects the index light beam transmitted through the lens to be detected by the light receiving element to obtain the optical characteristics of the lens to be tested.
In the case of a framed spectacle lens, the right and left spherical powers, cylindrical surface powers, and astigmatism axis angle spectacle value data can be obtained by selecting and measuring the left and right lenses. The obtained spectacle value data is stored in the IC card 32 via the IC card writer 34.

Reference numeral 40 is a control circuit of the near point meter 1, and the control circuit 40 controls the entire operation of the near point meter 1. Further, the control circuit 40 stores the objective value and the spectacle value data read from the IC card reader / writer 23 via the IC card 32 in the memory 41, and obtains them by measuring these data and the near point meter 1. Based on the obtained measurement result, the clear visual field of the eye to be inspected is controlled by drawing and printing output (described later).

[0028]

Next, the operation of the apparatus having the above-mentioned structure will be described.

The IC card 32 in which the objective value data obtained by the objective eye refractive power measuring device 30 and the spectacle value data obtained by the lens meter 33 are stored is inserted into the IC card reader / writer 23. The control circuit 40 transfers and stores each piece of information to the memory 41, and turns on an LED on the operation panel 22, which means data input, to indicate that.

Next, near point measurement is performed. The examiner fixes the subject's head to the head support portion 10 and slides the shielding plate 14 according to the measurement eye to shield the non-measurement eye. Then, the examiner operates the operation switch group 42 of the operation panel 22,
The subject inputs the selection of naked eye or correction, selection of measurement eye, and the like. According to the selection of the eye to be measured, the control circuit 40 turns on the optotype lamp 43 and drives the pulse motor 7 via the drive circuit to position the optotype presenting unit 3 at the innermost initial position.

[0031]

After the examiner confirms with the subject whether the measurement target of the target presenting unit 3 placed at the initial position can be clearly seen,
Press the start switch (not shown) to start the measurement. In the case of the eye to be inspected in which the measurement target at the initial position cannot be clearly seen, the forward / backward movement switch 20 is operated to move to a position where the measurement target can be clearly seen. If the near point is too far away to see clearly, the correction lens 13 is arranged in the eye-aid unit 11.

When the start switch signal is input, the control circuit 40 drives the pulse motor 7 to move the optotype presenting unit 3 toward the eye to be examined. The subject gazes at the measurement target moving toward him, and presses the response switch 21 when he cannot see clearly. When the signal from the response switch 21 is input, the control circuit 40 stops driving the pulse motor 7, obtains the target position (near point distance) from the number of pulses at that time, and stores it in the memory 41. After that, the target is returned to the position where the measurement was started.

By repeating such measurement, the control circuit 40
When the measured value is obtained a predetermined number of times, the median value is displayed on the display unit (not shown) as the measurement result, and the memory 4
1 is stored. The measurement is performed for each of the left eye, the right eye, and both eyes, and their near point distances are obtained.

[0034]

When the near point measurement is completed, after confirming that the LED indicating the completion of data input is lit, a measurement end switch (not shown) is pushed. The control circuit 40 reads out the near-point distance data, the objective value, and the spectacle value data of the subject stored in the memory 41, and draws and creates the clear visual field of the subject. Calculate.

The far point distance is calculated as follows (in the embodiment, the cylindrical surface refracting power is assumed to be negatively read).

[0036]

The spherical refractive power of the objective value data is AR _S , the cylindrical refractive power of the cylindrical surface is AR _C , and the spherical refractive power of the spectacle value data is L.
_Let M _{S be} the refractive power of the cylindrical surface to be LM _C, and the far point distance when the subject's eye does not have the refractive power of the cylindrical surface, and the far point distance P _FS (in the direction of the weak principal line) when the eye has the refractive power of the cylindrical surface. cm) is

[0037]

[Equation 1] Required by Further, the far point distance P _FC (cm) in the direction of the strong principal radius line when having a cylindrical surface refractive power is

[0038]

[Equation 2] Required by In addition, in this far point distance calculation, although there is objective value data, when the naked eye is selected at the time of near point measurement or when there is no spectacle value data, LM _S , LM _C
Is calculated as 0.

The control circuit 40 draws and creates the clear vision area of the subject based on the far point distances (far point distances in the weak main radial direction and the strong main radial direction) and the near points on the left and right sides. Output from the printer 24.

[0040]

FIG. 3 shows an example of an output created by drawing. 60
Is a face pattern that imitates the face of the subject. Reference numeral 61 is a target design showing a work target imitating a VDT screen, and a face design 60
It is drawn at a position separated by 50 cm from the eye position. Reference numerals 62 and 63 are clear vision area lines showing clear vision areas from the near point distance P _N of each of the left and right eyes to the far point distance (far point distance in the weak principal radius direction) P _FS . The start points of the clear viewing area lines 62 and 63 are plotted at positions separated by an amount corresponding to the values of the near point distances on the left and right with respect to the position of the target symbol 61, and the end point is the far point distance P _FS. The values are plotted at positions separated by the amount corresponding to. The position of the numerical plot does not have to be taken exactly, and it is sufficient if the target symbol 61 can be visually compared and contrasted with each other. Therefore, the position is roughly set as the distance becomes longer. When the far point distance P _FS calculated by the above equations 2 and 3 exceeds 500 cm or becomes negative, the clear visual field line is extended to the rightmost position and the far point distance numerical value is used. The symbol "∞" is attached.

[0041]

Reference numeral 64 is a clear vision zone line showing the clear vision zone from the near point distance of the right eye to the far point distance P _{FC in the} direction of the strong main radius line, the starting point of which is the same as that of the clear vision zone line 62 and the end point. Is plotted at positions separated by an amount corresponding to the value of the far point distance P _{FC in} the direction of the strong principal radius. This clear viewing zone line 64 is the refractive power of the cylindrical surface of the measurement eye (if there is spectacle value data, objective value data).
It is drawn when the cylindrical surface refraction power difference) is 0.75D or more. In the case where the left eye also has a refractive power of 0.75D or more, the same values as the clear viewing zone line 64 and the far point distance P _FC are drawn, but in the example of FIG. The drawing is not performed assuming that the refractive power is not 0.75D or more.

Reference numeral 65 is an eyeglass mark indicating that the near point measurement is based on the correction state, and is drawn when the correction measurement is selected during the measurement by the near point meter 1.

[0043]

By drawing such a clear visual field, a general subject who lacks specialized knowledge can easily understand the appearance of his / her eyes. For example, when the subject of the output result shown in FIG. 3 is engaged in VDT work, the target symbol 61 showing the VDT screen is compared with the position where the numerical values of the near point distance P _N of the left and right eyes are plotted. By doing so, it is shown that the near point is far in both eyes for performing the VDT work. In this case, the examiner indicates the drawing output to the effect that it is better to use reading glasses (a multifocal lens for the eye to be corrected for myopia, etc.) because the examiner lacks the accommodation power to perform the VDT work. However, he can easily give advice to the subject.

When the clear viewing zone line 64 is shown as in the case of the right eye in the drawing output example of FIG. 3, the position with the value of the far point distance P _{FC in} the direction of the strong main radius line is indicated. The numerical value indicates that there is a range in which the far point distance P _{FS in the} direction of the weak main line is blurred depending on the direction. Furthermore, this facilitates the explanation that correction of astigmatism is necessary.

[0045]

In the output example of drawing creation in FIG. 3, the target symbol 6
Although 1 is modeled on a VDT screen, it may be easier to understand if modeled on a newspaper or magazine instead of this depending on the visual environment in which the eye to be inspected is placed. In this case, the face pattern 60 is drawn at a position separated by an estimated distance of about 33 cm from the eye position (see FIG. 4). It is convenient to be able to select what is drawn as the target pattern 61 with a switch or the like.

In the above-mentioned embodiment, in the case of the eye to be inspected with astigmatism, the far point distance P _{FS in} the weak main radial direction and the far point distance P _FC in the strong main radial direction are obtained from the refractive power of the column surface. However, the far point may be calculated by converting to the equivalent spherical power.

Further, when the astigmatic axes of the eye to be inspected and the spectacle lens are deviated, a more accurate far point distance can be obtained by calculating the far point distance by the synthetic formula theory of the oblique cylinder, and further, astigmatism The axis angle may be displayed.

[0048]

The above embodiment can be variously modified.
The objective value information and the eyeglass value information can be input by connecting to another device with a communication cable, or by manually inputting the data. Further, the calculation of the far point distance, the creation of the clear visual field drawing, and the printout may be performed by the objective eye refractive power measuring device or the lens meter side.

[0049]

[0023]

[0050]

As described above, according to the present invention,
Since the measurable area is drawn by associating the measurement data obtained by the near point meter with the measurement data obtained from the objective eye refractive power measuring device or the lens meter, the general knowledge lacking specialized knowledge is required. The subject can also show the state of how his / her eyes are visible so that the subject can easily understand.

[Brief description of the drawings]

FIG. 1 is a schematic view of an outer appearance of a near-point meter that constitutes an apparatus according to an embodiment.

FIG. 2 is a block diagram illustrating a configuration of an apparatus according to an embodiment.

FIG. 3 is a diagram illustrating a printout example of clear-vision drawing.

FIG. 4 is a diagram showing a modification example of a target symbol in clear-vision region drawing.

[Explanation of symbols]

 1 Near-point meter 23 IC card reader / writer 30 Objective eye refractive power measuring device 32 IC card 33 Lens meter 40 Control circuit 41 Memory

Claims (7)

[Claims] 1. An ophthalmologic apparatus having a near point measuring means for measuring the accommodation limit of the eye to be examined at a short distance, the input means for inputting information on the refractive power of the eye to be examined, and the eye to be examined by the input means. Far point distance calculating means for obtaining a far point distance of the eye to be inspected based on information relating to refractive power, and a far point distance calculated by the far point distance calculating means and a near point distance by the near point measuring means. An ophthalmologic apparatus comprising: a drawing creating unit that creates a drawing of a clear visual field state of an optometry and a drawing output unit that outputs a drawing by the drawing creating unit. 2. The information regarding the refracting power of the eye to be input according to claim 1 is the objective refracting power information obtained by objectively measuring the eye and the refracting power of the spectacle lens worn by the subject. An ophthalmic device characterized by having spectacles refractive power. 3. The drawing creating means according to claim 1 has a means for drawing and creating a target pattern that imitates a work target object used at a near distance, and shows a clear viewing zone composed of a near point distance and a far point distance. An ophthalmologic apparatus which draws and creates a clear visual area pattern in association with the position of the target pattern. 4. The ophthalmologic apparatus according to claim 3, wherein the ophthalmologic apparatus has a plurality of target symbols that imitate a work target object used at a near distance, and has a selection unit that selects the target symbol. 5. The ophthalmologic apparatus according to claim 3, wherein the drawing creating means further attaches distance numerical values of a near point and a far point. 6. The far point distance calculating means according to claim 1, wherein there are two types of far distances in the direction of the strong main radial line and the direction of the weak main radial line according to the power of the cylindrical surface power from the objective refractive power information and the spectacle refractive power information. An ophthalmologic apparatus characterized by calculating points. 7. The ophthalmologic apparatus according to claim 1, wherein the far point distance calculating means, the drawing creating means, and the drawing output means are integrally provided.