JPH04224732A - Eye pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To provide an eye pressure measuring apparatus which enables accurate measuring operation. CONSTITUTION:This apparatus is made up of an operation panel key 18, a means of projecting a luminous flux for detection of alignment on an eye E to be inspected, a light receiving means for receiving the reflected alignment luminous flux from the type E to be inspected, a means adapted to deform the cornea Ec of the eye E to be inspected by blowing an air flow from a nozzle 5 according to an output from the light receiving means, a means adapted to compute an eye pressure value detecting how the cornea Ec of the eye to be inspected deforms and a means for displaying the eye pressure value. Information to be obtained by the operation of the panel key 18 or the eye pressure value immediately after the blowing of the air flow is displayed in expanded characters thereby allowing the reporting of inadvertent key operation or reporting of the eye pressure value accurately in real time.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an intraocular pressure measuring device, more specifically, a device for deforming the cornea of an eye to be examined by blowing airflow in accordance with the output from a light receiving means that receives an alignment light beam reflected from the eye to be examined. The present invention relates to an intraocular pressure measuring device that measures intraocular pressure.

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. In order to detect this alignment, the examiner visually matches the subject's eye on the observation TV monitor with the positioning mark and searches for the best point of alignment. In addition, to solve this problem, the best alignment point is automatically recognized, and when the best alignment is obtained, airflow is automatically blown and the intraocular pressure is measured.

[0005] Furthermore, when performing an intraocular pressure measurement operation, various panel keys must be operated, and information on the operated panel keys or the intraocular pressure measurement result is displayed on a display monitor. In conventional intraocular pressure measuring devices, even when a panel key is operated, an indicator light on the panel changes and lights up, or the status is simply displayed in normal font size on a TV monitor. Furthermore, the intraocular pressure value immediately after the airflow was blown was simply displayed at a predetermined position on the monitor.

However, in intraocular pressure measuring devices that require highly accurate alignment, alignment is performed while visually observing the TV monitor, so it is easy to accidentally touch a panel key and switch modes. There has been a problem in that patients are not aware of the presence of airflow, and the test subject is blown with more airflow than necessary, or airflow cannot be obtained.

[0007] Therefore, the present invention has been made to solve these problems, and an object of the present invention is to provide an intraocular pressure measuring device that enables reliable measurement operations.

[0008]

[Means for Solving the Problems] In order to solve this problem, the present invention includes an operation panel key, a means for projecting an alignment detection light beam onto the subject's eye, and a means for receiving the alignment reflected light flux from the subject's eye. a light receiving means, a means for blowing airflow from a nozzle according to the output from the light receiving means to deform the cornea of the eye to be examined, a means for detecting a deformed state of the cornea of the eye to be examined and calculating an intraocular pressure value, and the above-mentioned intraocular pressure. The device is equipped with a means for displaying values, and is configured to display information obtained by operating the panel keys or the intraocular pressure value immediately after the airflow is displayed in enlarged letters.

[0009]

[Function] With this configuration, the contents of the panel key operations or the intraocular pressure value immediately after the airflow can be displayed in enlarged letters on the display means that the examiner is observing, so that careless It is possible to notify the user of key operations or to reliably notify the intraocular pressure value in real time.

0010

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 of 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 transmitted through a mirror 2.
After being reflected, 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.

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.

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 manual switch 15 for manually operating the nozzle 5 is connected to the arithmetic processing circuit 10, as will be described later. Furthermore, panel key 1 performs key operations necessary for intraocular pressure measurement.
8 is provided.

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

[0015] First, the patient rests his forehead on the forehead rest and sits in a predetermined position. The alignment detection light source 1 is turned on, and the light from the light source 1 is reflected by the mirror 2, then the lens 3,
The cornea Ec of the eye E to be examined is irradiated via an optical system consisting of four components. 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 arithmetic processing circuit 10 displays on the monitor 13 the state in which the eye to be examined is aligned with the apparatus. For example, as shown in FIG. 2A, alignment points 20 are displayed according to the amount of light received by the photoelectric conversion element 7. The examiner observes this alignment point 20 and makes further adjustments to achieve alignment so that it is at the best point (for example, the center). Alternatively, if the AUTO mode of the panel key is selected, alignment is automatically performed. When the alignment is performed at the best point in this manner, airflow is ejected from the nozzle 5 via the drive circuit 17 automatically or manually. 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. This state is shown in Figure 2 (A).
The calculated intraocular pressure value 21 is displayed on the monitor 13.
shown above.

In this embodiment, alignment is performed while visually observing the TV monitor, so if the panel key 18 is inadvertently touched and the test subject does not notice that the mode has been switched, As mentioned above, there is a problem of airflow being blown or not being obtained, so in order to solve this problem, for example, the airflow can be obtained by operating the panel keys as shown in FIGS. AUTO information is displayed in enlarged letters, or the intraocular pressure value immediately after airflow is blown in enlarged letters. This makes it possible to notify of careless key operations or to reliably notify the intraocular pressure value in real time.

The information to be enlarged and displayed is not limited to that shown in FIG. 2, but may be other panel key operation information or other measurement results.

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.

[0021]

As explained above, in the present invention, the operation panel key, the means for projecting the alignment detection light beam onto the subject's eye, the light receiving means for receiving the alignment reflected light flux from the subject's eye, and the light receiving means. means for deforming the cornea of the eye to be examined by blowing airflow from a nozzle according to the output of the eye, means for detecting the deformed state of the cornea of the eye to be examined to calculate an intraocular pressure value, and means for displaying the intraocular pressure value, The information obtained by operating the panel keys or the intraocular pressure value immediately after the airflow is displayed in enlarged letters, so it can be used to notify you of careless key operations or to reliably inform you of the intraocular pressure value in real time. be able to.

[Brief explanation of the drawing]

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

FIG. 2 is an explanatory diagram when the intraocular pressure measurement results are displayed on a monitor.

[Explanation of symbols]

1 Light source for alignment detection 5 Nozzle 8 TV camera 10 Arithmetic processing circuit 12 Composite circuit 13 Display monitor

Claims (1)

[Claims] 1. An operation panel key, a means for projecting an alignment detection light beam onto the subject's eye, a light receiving means for receiving the alignment reflected light flux from the subject's eye, and a device for blowing an air stream from a nozzle in accordance with the output from the light receiving means. means for deforming the cornea of the eye to be examined, means for detecting the deformed state of the cornea of the eye to be examined and calculating an intraocular pressure value, and means for displaying the intraocular pressure value, An intraocular pressure measuring device characterized in that the intraocular pressure value immediately after the airflow is blown is displayed in enlarged letters.