JPH0542803Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a model fundus, especially in the area of ophthalmological measurements, in which the fundus is irradiated with laser light and the laser light diffusely reflected from blood cells is detected based on the light scattering phenomenon. The present invention relates to a fundus model that can be used for adjustment, inspection, calibration, etc. of an ophthalmological measurement device that analyzes the output signal and measures the state of blood flow in the fundus tissue.

[Prior art] Conventionally, in the field of ophthalmological measurements, the fundus of the eye is irradiated with laser light, the laser light that is diffusely reflected from blood cells is detected based on the light scattering phenomenon, and the output signal is analyzed to determine the blood in the fundus tissue. Since there is no model fundus that has similar light scattering characteristics due to laser light to the fundus of the human eye that can be used for adjusting, testing, and calibrating the ophthalmological measuring device that measures the flow state, we will first make adjustments directly using the human eye. and were conducting inspections. The data obtained with the human eye lacks reproducibility, making it difficult to adequately adjust, test, and calibrate the measuring device.

[Problem to be solved by the invention] The invention was made based on the above-mentioned situation, and is intended to provide a model fundus that can be used for adjusting, testing, and calibrating ophthalmological measurement devices. It is.

[Means for solving the problem] According to the present invention, in order to solve the above problem,
a lens having a refractive power corresponding to the refractive power of the eye;
A transparent film-like body that has properties equivalent to the retina of the eye by enclosing a liquid that has dynamic light scattering properties by laser light similar to those of fundus tissue; A model fundus is employed, which has a transparent capillary tube into which a liquid having light scattering properties by laser light similar to that of blood flows, and a tube connected to the capillary tube through which a liquid resembling blood flows into the capillary tube via a pump. ing.

[Function] Since the fundus model of the present invention is configured as described above, it can be used for testing and calibrating an ophthalmological measuring device using data with sufficient reproducibility.

In addition, in the embodiment of the present invention, it is possible to make the model fundus perform movements similar to eye movements, so it is possible to obtain data that is closer to that of the human eye, and to understand the influence of eye movements on measurement results. can do.

[Example] Hereinafter, details of the present invention will be explained using examples shown in the drawings.

In this example, the model fundus is constructed by irradiating the fundus with laser light in the ophthalmological measurement area, detecting the laser light diffusely reflected from blood cells based on the light scattering phenomenon, and analyzing the output signal. The following description assumes that the present invention is used for testing and calibrating an ophthalmological measuring device that measures the blood flow state of the fundus tissue.

The overall configuration shown in FIG. 1 is one embodiment of the model fundus of the present invention, which is made of a transparent membrane-like body that has dynamic light scattering properties by laser light similar to the retina of the eye. A liquid 1 having dynamic light scattering properties similar to those of the fundus tissue is contained in a housing-like case 10.
2 is included. The above-mentioned dynamic light scattering characteristics are realized by mixing fine particles with several types of appropriate particle sizes into the liquid. A transparent thin tube 14 resembling a blood vessel in the fundus of the eye is provided on the front surface of the case 10, a tube 16 is connected to the entrance and exit of the thin tube 14, and a pump 18 is connected to the tube 16. A liquid 20 having dynamic light scattering properties (similarly realized by mixing fine particles) with laser light similar to that of blood flowing through blood vessels in the fundus of the eye is flowed into the thin tube 14 via the pump 18 and tube 16. There is. Further, a lens 22 having a refractive power corresponding to the refractive power of the eye is disposed on the front surface of the case 10.

Note that the case 10 is provided with a drive device (not shown) such as an electric stage, and can reciprocate in the direction of arrow a in the figure.

The model shown in FIG. 2 is another embodiment of the fundus model according to the present invention, and has substantially the same structure as the first embodiment shown in FIG. In this embodiment, the case 10 and the lens 22 are arranged so that the lens barrel 30 corresponds to the positional relationship between the crystalline lens and the fundus of the eye.
is attached to. Further, the lens barrel 30 is provided with a drive device (not shown) such as an electric stage so as to be able to rotate in the direction of arrow b in the figure around an axis corresponding to the rotation center of the eye.

Next, a method of using the fundus model of the present invention constructed as described above will be explained.

Against the background of a case 10 filled with a liquid 12 that has dynamic light scattering properties similar to those of the fundus tissue, blood flows from a pump 18 through a tube 16 into a thin tube 14 corresponding to a blood vessel in the fundus. A liquid 20 with similar dynamic light scattering properties is flowed, creating a situation similar to the human eye. lens 22
The thin tube 14 is irradiated with a laser beam from a light source of an ophthalmological measuring device (not shown) through the thin tube 14, and the laser beam diffusely reflected from the liquid 20 flowing inside the thin tube 14 is received by a light receiving device (not shown). The signal obtained from this light receiving device is analyzed and used for testing or calibrating the ophthalmological measuring device.

When used for testing or calibrating an ophthalmological measuring device as described above, the model fundus is moved in the direction of the arrow a in FIG. 1 using a drive device (not shown), as in the first embodiment. The actual movement of the eyeball can be simulated by moving it, or by moving it in the direction of arrow b in FIG. 2 using a drive device (not shown) as in the case of the second embodiment. Then, it is possible to understand the relationship between eyeball movements and measurement data.

[Effects of the invention] As is clear from the above description, the fundus model of the invention encloses a lens having a refractive power corresponding to that of the eye and a liquid having dynamic light scattering properties similar to the fundus tissue. A transparent membranous body having properties corresponding to the retina of an eye; a transparent tubule that is adhered to the transparent membranous body and through which a liquid having light scattering properties similar to blood flows; and the tubule. This model has a tube that is connected to a tube that flows the blood-like liquid into the capillary tube through a pump, so by using this model fundus, ophthalmological measurements can be performed using data with sufficient reproducibility. If the device can be inspected and calibrated, and if the model fundus can be made to perform movements similar to eye movements, it is possible to obtain data that is more similar to the human eye, and the eye movements can be reflected in the measurement results. The excellent effect of being able to investigate the influence on

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating one embodiment of the model fundus of the present invention, and FIG. 2 is a sectional view illustrating the second embodiment. 10... Case, 12, 20... Liquid, 14...
...Tube, 16...Tube, 18...Pump, 2
2...lens, 30...lens barrel.

Claims (1)

[Claims for Utility Model Registration] 1. A lens that has a refractive power equivalent to that of the eye and a liquid that has dynamic light scattering properties by laser light similar to the fundus tissue, which corresponds to the retina of the eye. a transparent membrane-like body with specific properties; a transparent thin tube that is adhered to the transparent membrane-like body and through which a liquid having laser light scattering properties similar to blood flows; and a pump connected to the thin tube; A fundus model, comprising: a tube through which the blood-like liquid flows into the thin tube. 2. The fundus model according to claim 1, wherein the fundus model is configured to move in a manner corresponding to eyeball movement.