JPH04224729A - Ophthalmological apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus, and more particularly to an ophthalmologic apparatus such as an intraocular pressure apparatus that requires a high level of alignment between the eye to be examined and a measuring device.

0002

BACKGROUND OF THE INVENTION For example, intraocular pressure measuring devices are known that measure intraocular pressure by injecting fluid onto the corneal surface and measuring the time until corneal applanation or the pressure signal when the corneal deformation detection signal reaches its maximum. (Japanese Patent Application No. 192331, Japanese Patent Publication No. 63-58577).

[0003] In such an ophthalmological apparatus, an airflow generated by a constant pressure is blown onto the center of the cornea of the eye to be examined, and the time required for the cornea to deform into a flat surface or the time when the corneal deformation detection signal reaches its maximum is measured. The intraocular pressure is calculated from the pressure signal. Whether or not the cornea has been applanated is determined by the maximum amount of light received by a light receiving element that receives light from a light source such as an LED through a lens. In this case, the light source, lens,
A measurement optical system consisting of a light receiving element is incorporated into the apparatus in a predetermined positional relationship with an alignment optical system so that the angle of incidence and the angle of reflection on the applanated corneal surface are equal.

0004

[Problem to be Solved by the Invention] In this case, if the intraocular pressure measuring device and the eye to be examined are not in an accurate predetermined positional relationship, the measurement error will increase. It is positioned at a predetermined operating position such that the above-mentioned reflection occurs during corneal applanation with respect to the eye to be examined. Furthermore, a detection function such as a forehead rest detection switch that detects whether or not the patient is seated with his or her forehead resting on the forehead rest is provided. Airflow is applied and intraocular pressure is measured only when alignment is achieved.

However, with devices that measure intraocular pressure by blowing airflow onto the subject's eye, patients instinctively run away from the device out of fear or discomfort when the airflow is blown onto them, and as a result, their forehead There was a problem in that the contact detection switch was not turned on and the airflow was not blown, which required time for measurement.

[0006] Therefore, the present invention has been made to solve these problems, and an object of the present invention is to provide an ophthalmological measuring device that can cancel the forehead rest detection function and can perform ophthalmological measurements in a short time. .

[0007]

[Means for Solving the Problems] In order to solve this problem, the present invention provides forehead rest detection means for detecting a patient's forehead rest by detecting contact with the patient's forehead, and the patient's eye to be examined. means for detecting alignment with respect to the measuring device; means for activating the measuring device when alignment with the patient's forehead rest is detected; and means for canceling the detection function of the forehead rest detecting means; A configuration was adopted in which the measuring device is activated only when alignment is detected when the detection function by the means is canceled.

[0008]

[Operation] With this configuration, when the detection function by the forehead rest detection means is canceled, the measuring device can be operated only when alignment is detected, so the measuring device can be operated regardless of the patient's psychological state. Accurate measurements can be made in a short amount of time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below according to embodiments shown in the drawings.

FIG. 1 shows an example in which the present invention is applied to an intraocular pressure measuring device. In the figure, the reference numeral 1 is a light source for alignment detection, and the light from this light source 1 is as follows: After being reflected by the mirror 2, the light is irradiated onto the cornea Ec of the eye E to be examined via an optical system consisting of lenses 3 and 4. In this case, when the patient places his/her forehead on a forehead rest (not shown) and sits in a predetermined position, the forehead rest switch 20 is turned on.

The light beam reflected by the cornea Ec passes through the original optical system, is reflected by the mirror 6, and is received by the photoelectric conversion element 7. The photoelectrically converted output signal is converted into a digital signal by an A/D converter 9 and then input to an arithmetic processing circuit 10 . The image of the cornea Ec of the eye to be examined illuminated by the observation illumination light source 14 enters the observation camera 8 through the optical system of the lenses 4 and 3. The light beam incident on the observation camera 8 is converted into a video signal, which is combined in a composite circuit 12 with the intraocular pressure value obtained from the character generation circuit 11 by air blowing from the nozzle 5, and output to the TV monitor 13.

[0012] Drive circuit 1 connected to arithmetic processing circuit 10
When the airflow is blown from the nozzle 5 by 7, the cornea of the eye to be examined is deformed, and when it deforms until it becomes flat, the light receiving element 1
6 detects this, and the arithmetic processing circuit 10 calculates the intraocular pressure. A cancel switch 15 for canceling the forehead rest detection function is connected to this arithmetic circuit 10.

Next, the operation of the apparatus having such a configuration will be explained.

[0014] First, the patient rests his forehead on the forehead rest and sits in a predetermined position. At this time, the forehead rest switch 20 is turned on. The alignment detection light source 1 is turned on, and the light from the light source 1 is reflected by the mirror 2 and then irradiated onto the cornea Ec of the eye E to be examined via an optical system consisting of lenses 3 and 4. The light beam reflected by the cornea Ec passes through the original optical system and returns to the mirror 6.
The light is reflected by the photoelectric conversion element 7 and received by the photoelectric conversion element 7. The photoelectrically converted output signal is converted into a digital signal by an A/D converter 9 and then input to an arithmetic processing circuit 10 .

When the arithmetic processing circuit 10 detects that the subject's eye is aligned with the apparatus, the photoelectric conversion element 7 receives a predetermined amount of light, and the forehead rest switch 20 is turned on, the drive circuit 17 is activated. Outputs a signal to and drives it. When the airflow is blown from the nozzle 5, the cornea of the eye to be examined is deformed. When the cornea deforms until it becomes flat, the light receiving element 16 detects this, and the arithmetic processing circuit 10 calculates the intraocular pressure based on the time until corneal applanation or the pressure signal when the corneal deformation detection signal is at its maximum.

The intraocular pressure value calculated by the calculation processing circuit 10 is
The character generation circuit 11 converts the data into characters (numeric values) and inputs them into the composite circuit 12. The image of the cornea Ec of the eye to be examined illuminated by the observation illumination light source 14 is input to the observation camera 8 through the optical system of lenses 4 and 3, and is converted into a video signal. It is combined with the pressure value and output to the TV monitor 13.

In this embodiment, when the release switch 15 for canceling the forehead rest detection function is activated, the arithmetic processing circuit 10 is driven according to whether or not alignment has been achieved, regardless of the signal from the forehead rest switch 20. circuit 17
Activate. That is, when the forehead rest detection function is canceled, the arithmetic processing circuit 10 outputs a signal to the drive circuit 17 only when alignment is detected, and blows airflow from the nozzle 5 to measure the intraocular pressure. Therefore, in this case, even if the patient instinctively runs away from the device due to fear or discomfort when the airflow is blown, as long as alignment is achieved, the airflow will be blown and the patient's psychological The measuring device can be operated regardless of the state, allowing accurate measurements to be made in a short period of time.

Although the above-mentioned embodiment has been explained using an intraocular pressure measuring device as an example, the present invention is not limited thereto, and can be used in other ophthalmological measuring devices that require a high degree of alignment.

[0019]

As explained above, the present invention includes a forehead rest detection means for detecting a patient's forehead rest by detecting contact with the patient's forehead, and an alignment of the patient's eye with respect to the measuring device. a means for detecting, a means for activating a measuring device when alignment with the forehead rest of the patient is detected, and a means for canceling a detection function by the forehead rest detection means, wherein the detection function by the forehead rest detection means is canceled. Since the measuring device is activated only when alignment is detected, the measuring device can be activated regardless of the patient's psychological state, making it possible to perform accurate measurements in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.

[Explanation of symbols]

1 Light source for alignment detection 5 Nozzle 8 TV camera 10 Arithmetic processing circuit 12 Composite circuit

Claims (3)

[Claims] Claims: 1. Forehead rest detection means for detecting a patient's forehead rest by detecting contact with the patient's forehead; means for detecting alignment of the patient's eye to be examined with respect to a measurement device; A means for activating the measuring device when alignment is detected, and a means for canceling the detection function by the forehead rest detection means, and when the detection function by the forehead rest detection means is released, the alignment is detected. An ophthalmological device characterized in that only a measuring device is operated. 2. The ophthalmologic apparatus according to claim 1, wherein the measuring device is an intraocular pressure measuring device. 3. The intraocular pressure measuring device comprises an airflow blowing means for compressing gas in a cylinder with a piston and causing deformation of the cornea of the eye to be examined through a nozzle spaced a predetermined distance from the cornea of the eye to be examined; 3. The ophthalmologic apparatus according to claim 2, further comprising a corneal deformation detecting means for optically detecting a deformed state of the cornea of the eye to be examined due to air blowing.