JPH09220198A - Ophthalmological instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmological instrument with a signaling device to stop examinations whenever an eyelid is detected to be below a specified position. SOLUTION: An image of a front part of an eye under an ophthalmoscopic examination is captured by a television camera 4, and is transmitted to an image capturing memory 9. Thus, reflection images from a cornea illuminated by an outer eye illuminating lamp 5 is detected. After the reflection images from a cornea S is detected, a measurement starting switch 11 is pressed, and a driving signal to drive a piston 6 is outputted from a CPU 10 to a solenoid 7. On the other hand, when the reflection images from a cornea are not detectable, namely when an eyelid is below a specified position, an ophthalmoscopic examination is not performed because the CPU 10 does not send the driving signal to the solenoid 7 even the measurement starting switch 11 is pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus capable of detecting that the eyelid of a subject's eye is lowered.

[0002]

2. Description of the Related Art Conventionally, in an ophthalmologic apparatus such as a non-contact tonometer, when the eyelid is lowered, the air discharged from the nozzle is evenly distributed to the cornea in order to flatten the cornea of the eye to be examined. Since it is not sprayed, the measurement accuracy is reduced. Therefore, the examiner carries out alignment while observing the anterior segment of the subject, and then performs measurement after confirming that the eyelids are not lowered.

[0003]

However, in the above-mentioned conventional example, the examiner may perform the measurement without noticing even if the eyelid is lowered, and the measurement accuracy at the time of the optometry deteriorates. There is.

A first object of the present invention is to solve the above-mentioned problems and to provide an ophthalmologic apparatus capable of prohibiting measurement when it is detected that the eyelid is lower than a predetermined position. .

A second object of the present invention is to provide an ophthalmologic apparatus which displays a lid lowering warning on the display means when it is detected that the eyelid is lowered.

[0006]

An ophthalmologic apparatus according to a first aspect of the present invention for achieving the above object is an ophthalmologic apparatus having a control means for controlling measurement, wherein an eyelid is located at a predetermined position according to anterior eye segment information of an eye to be examined. It is characterized in that it further comprises eyelid drop detection means for outputting a signal for prohibiting measurement to the control means when it is detected that it is also lowered.

An ophthalmologic apparatus according to a second aspect of the present invention is an ophthalmologic apparatus having display means for displaying an image of the anterior segment of the eye and measurement data, wherein the eyelid is lower than a predetermined position according to the anterior segment information of the eye to be examined. When the eyelid drop detection means for detection outputs a measurement prohibition signal, a lid drop warning is displayed on the display means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a block diagram of a non-contact tonometer of the first embodiment, in which an optometry unit 2 having a nozzle 1 and an air compression chamber is arranged at a position facing the eye E to be examined of the apparatus, A lens 3 and a television camera 4 are arranged on the optical axis behind the optometry unit 2. Further, an external eye illumination lamp 5 is arranged near the upper part of the optometry unit 2,
A piston 6 is attached to the optometry unit 2, and the piston 6
Is driven by the solenoid 7.
The position of the external illumination lamp 5 is adjusted so that the corneal reflection image on the cornea of the eye E to be inspected generated by the lamp 5 is at a predetermined position of the cornea.

The output of the TV camera 4 is the TV monitor 8,
Each is connected to the image capturing memory 9, and the memory 9 is C
It is connected to PU10. The CPU 10 is connected to the outputs of the measurement start switch 11 and the eyelid drop detection selection switch 12, the output of the CPU 10 is connected to the character generator 13, and the output of the character generator 13 is connected to the television monitor 8.

The image of the anterior segment of the eye E to be examined is the television camera 4
The captured image is transmitted to the image capturing memory 9 and is subjected to image processing in the CPU 10,
The corneal reflection image by the outer-eye illumination lamp 5 is detected. Note that this operation can be performed sequentially.

FIG. 2 is an image of the anterior segment on the television monitor 8 when the eyelids are sufficiently raised, where P is the cornea and S
Is a bright spot of a corneal reflection image by the external illumination lamp 5. When the measurement start switch 11 is pressed after the corneal reflection image S is detected at a predetermined position, a drive signal is output from the CPU 10 to the solenoid 7 to raise the piston 6 and increase the air pressure in the optometry unit 1 to increase the nozzle. An air flow is ejected from 1 and a measurement is performed.

On the other hand, FIG. 3 shows an image when the eyelid is lowered. When the corneal reflection image S is hidden by the eyelid and cannot be detected, that is, when the eyelid is lower than a predetermined position, the measurement start switch 11 is turned on. Even if it is pressed, the CPU 10 does not send a drive signal to the solenoid 7, so that the measurement is not performed.

When the corneal reflection image S is hidden by the eyelids and cannot be detected, a warning such as "Eyelid UP" may be displayed on the television monitor 8 to alert the examiner. . In addition, the eyelid drop detection can be turned on / off by the selection switch 12, and when it is off, measurement can be performed even if the eyelid is lowered. Also, the measurement can be performed with low accuracy.

Although the above description is of the embodiment applied to the non-contact tonometer, FIGS. 4 and 5 show anterior ocular segment images when applied to the corneal shape measuring apparatus of the second embodiment, which are publicly known. The configuration of the corneal shape measuring device is omitted.

FIG. 4 is an image of the anterior segment on the television monitor 8 when measuring the shape of the cornea P, and R is the earring. The corneal shape measuring device measures the corneal shape by pattern-recognizing the image of the earring R projected on the cornea P. Therefore, if the eyelid hangs on the earrings R and a part of the earrings R is cut off, the measurement accuracy is lowered.

In order to prevent this, as shown in FIG. 5, when it is recognized that the eyelid of the eye to be inspected is lowered and the Mairing R is cut by a predetermined length or more, as in the first embodiment. By prohibiting measurement and displaying a warning on the display,
It is possible to avoid making inaccurate measurements.

[0017]

As described above, the ophthalmologic apparatus according to the first aspect of the invention prohibits the measurement when detecting that the eyelid is lowered, thereby performing the measurement in the state where the eyelid of the eye to be inspected is lowered. Since it is possible to prevent the measurement from being performed, it is possible to perform measurement with high measurement accuracy and increase the reliability of the measured value.

Further, the ophthalmologic apparatus according to the second invention displays a warning when it detects that the eyelids are lowered, so that the examiner should be careful not to perform measurement with low accuracy during measurement. Can be urged.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a non-contact tonometer according to a first embodiment.

FIG. 2 is an explanatory diagram when an eyelid is sufficiently raised.

FIG. 3 is an explanatory diagram when an eyelid is lower than a predetermined position.

FIG. 4 is an explanatory diagram showing a state in which the Mayering is not broken by the eyelids of the second embodiment.

FIG. 5 is an explanatory diagram showing a state in which the earrings are cut off by the eyelids.

[Explanation of symbols]

 1 Nozzle 2 Optometry Unit 3 Lens 4 Television Camera 5 External Eye Lamp 8 Television Monitor 9 Image Capture Memory 10 CPU 11 Measurement Start Switch 12 Eyelid Drop Detection Switch 13 Character Generator

Claims (6)

[Claims] 1. An ophthalmologic apparatus having a control means for controlling the measurement, when the eyelid information of the eye to be examined detects that the eyelid is lower than a predetermined position, the control means is prohibited from performing the measurement. An ophthalmologic apparatus comprising: an eyelid drop detection unit that outputs the signal of 2. The eyelid drop detecting means includes an illuminating means for illuminating the anterior segment of the eye and an image capturing means for capturing an image of the anterior segment of the subject's eye, and the position of the corneal reflection image produced by the illuminating means is the cornea. When the illuminating means is arranged so as to be at a predetermined position, and when the bright point of the corneal reflection image generated by the illuminating means disappears in the anterior ocular segment image of the subject's eye imaged by the imaging means, the eyelids disappear. The ophthalmologic apparatus according to claim 1, which detects that the position is lower than a predetermined position. 3. The ophthalmologic apparatus according to claim 1, further comprising selection means for selecting ON / OFF of the measurement prohibition signal output of the eyelid drop detection means. 4. An ophthalmologic apparatus having a display unit for displaying an image of the anterior segment and measurement data, from an eyelid descent detecting unit for detecting that the eyelid is lower than a predetermined position based on the anterior segment information of the eye to be examined. An ophthalmologic apparatus which displays an eyelid drop warning on the display means when a measurement prohibition signal is output. 5. The eyelid drop detecting means includes an illuminating means for illuminating the anterior segment of the eye and an imaging means for capturing an image of the anterior segment of the subject's eye, and the position of the corneal reflection image produced by the illuminating means is the cornea. When the illuminating means is arranged so as to be at a predetermined position, and when the bright spot of the corneal reflection image generated by the illuminating means disappears in the anterior ocular segment image of the subject's eye imaged by the image capturing means, the eyelids disappear. The ophthalmologic apparatus according to claim 4, wherein the ophthalmologic apparatus detects that the position is lower than a predetermined position. 6. The ophthalmologic apparatus according to claim 4, further comprising a selection unit that selects ON / OFF of the measurement prohibition signal output of the eyelid drop detection unit.