JPH04224733A - Eye pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To enable easily visible display and accurate measuring operation by achieving a display of an eye pressure value to be displayed or a mode display in a black rimed manner. CONSTITUTION:A light source 1 for alignment detection is turned ON and after reflected with a mirror 2, light from the light source 1 is made to irradiate a cornea Ec of an eye E to be inspected through an optical system comprising lenses 3 and 4. A luminous flux reflected from the cornea Ec is reflected with the mirror 6 and received with an photoelectric transducer 7 passing through an original optical system. After converted into a digital signal with an A/D converter 9, an output signal converted to electricity is inputted into an arithmetic processing circuit 10. Then, an eye pressure value computed is converted into a character with a character generation circuit 11 to be inputted into a compound circuit 12. An image of the cornea Ec of the eye to be inspected lighted with an observation light source 14 is impinged into a camera for observation through the optical system of the lenses 4 and 3 and synthesized with the eye pressure value by means of the compound circuit 12 to be outputted to a TV monitor 13.

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 measurement devices, the text display area on the TV monitor is displayed with a black mask in order to make it easier to see the display of the intraocular pressure value or measurement mode (manual or automatic mode, etc.). Information displayed on a TV monitor is important in an intraocular pressure measurement device that requires highly accurate alignment, but conventionally there has been a problem that this information is interfered with by a black mask and alignment takes time.

[0006] 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 provides an easy-to-read display and a reliable measurement operation.

[0007]

[Means for Solving the Problems] In order to solve this problem, the present invention provides means for projecting an alignment detection light beam onto the eye to be examined, a light receiving means for receiving the alignment reflected light beam from the eye to be examined, and a light receiving means for receiving the alignment reflected light beam from the eye to be examined. 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; 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 present invention adopts a configuration in which the displayed intraocular pressure value or mode display is displayed with a border.

[0008]

[Effect] In this configuration, the displayed intraocular pressure value or mode display is displayed with a black border, for example, so the displayed information in the part blocked by the black mask can be used effectively. can.

[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 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.

[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 manual switch 15 for manually operating the nozzle 5 is connected to the arithmetic circuit 10, as will be described later. Furthermore, panel keys 18 are provided for performing key operations necessary for measuring intraocular pressure.

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. 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 case, since the display was performed within a predetermined display area by providing a mask 22 as shown in FIG. 2A, the observation area became small and alignment or measurement took time. In this embodiment, the masked display as shown in FIG. 2B is stopped, and the intraocular pressure value 23 or measurement mode display information 24 is displayed with a border. This makes it possible to enlarge the observation area and to make the displayed information easier to see.

The information to be displayed in an enlarged manner is not limited to bordering, but may be displayed in other ways such as shading.

Furthermore, although the above-described embodiments have been explained using an intraocular pressure measuring device as an example, the present invention is not limited thereto, and can also be used in other ophthalmological measuring devices that require a high degree of alignment.

[0020]

As explained above, the present invention includes 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 nozzle according to the output from the light receiving means. A method for displaying intraocular pressure comprising means for blowing airflow to deform the cornea of the eye to be examined, 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. Since the value or mode display is displayed with a border, it is possible to effectively use the displayed information in the area that is blocked by the black mask.

[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. A means for projecting an alignment detection light beam onto the eye to be examined; a light receiving means for receiving the alignment reflected light beam from the eye to be examined; means for deforming the cornea of the eye to be examined, means for calculating an intraocular pressure value by detecting the deformed state of the cornea of the eye to be examined, and means for displaying the intraocular pressure value; An intraocular pressure measuring device characterized by displaying the following information.