JPH0249633A - composite model eye - 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] [Industrial Application Field] The present invention provides a complex ophthalmological machine capable of measuring axial length using ultrasonic waves and measuring corneal shape using an optical method in the same device. This article relates to a composite eye model used for.

[Prior Art] A complex ophthalmological machine that can measure the axial length of the eye using ultrasound and the radius of corneal curvature using an optical method has already been developed. 60-203
It has been filed as No. 027. However, a composite eye model that is convenient for testing, calibrating, and daily management of these composite ophthalmological machines has not yet been developed, and each eye model has a plate-like body or a plate-shaped body for measuring axial length. Columnar bodies are used, and steel balls, lenses, etc. are used individually for keratometry.

As described above, in the past, individual model eyes have been used separately, which poses the problem of extremely cumbersome installation and management of the eye models.

[Object of the Invention] An object of the present invention is to improve the conventional problems by integrating an eye model for measuring axial length using ultrasound and an eye model for measuring corneal shape. The objective is to provide a convenient composite eye model.

[Summary of the invention] The gist of the present invention is to achieve the above objects.

An ultrasonic probe contacting surface and an ultrasonic reflecting surface substantially perpendicular to the axis are provided at both ends of a rod-shaped ultrasonic conductor, and an ultrasonic probe contact surface and an ultrasonic reflecting surface are provided at the ends provided with the ultrasonic reflecting surface for blocking ultrasonic conduction. This is a composite model eye characterized in that a spherical reflector is attached through a gap 17, and an optical spherical reflective surface is provided on the surface of the spherical reflector.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of a composite model eye according to the present invention.
is an ultrasonic conductor for measuring the axial length of the eye, which is made of a material such as aluminum and has a cylindrical or prismatic shape, for example. At one end of the ultrasonic conductor 1, there is provided an ultrasonic probe contact surface 2 substantially perpendicular to the axis xx, and an annular protrusion 3 surrounding the contact surface 2. This annular protrusion 3 prevents the ultrasonic probe from coming into contact with the vicinity of the outer circumference of the ultrasonic conductor l and preventing unauthorized reflection of ultrasonic waves caused by the outer circumferential surface, and also prevents damage or deformation of the ultrasonic probe contact surface 2 due to the falling ring. The ultrasonic reflecting surface 4 is provided at the other end of the ultrasonic conductor 1 to reflect the ultrasonic waves transmitted from the ultrasonic probe contact surface 2 side. - It is provided approximately perpendicularly to x. Further, a holder 6 is fitted to this end via a gap 5 for blocking ultrasonic transmission, and a spherical reflector 7 is attached to the holder 6 for keratometry. has a spherical reflective surface 8 on its surface with a radius of curvature of about 5 to limrn, which is close to the cornea of the human eye.
For this spherical reflecting surface 8, it is preferable to use, for example, an optical glass lens coated with a reflectance of about 1.3 to 1.degree. Further, the back surface 9 of the spherical reflector 7 has a radius of curvature that does not interfere with detection of reflection of light from the spherical reflecting surface 8 on the front side, or is provided with other anti-reflection means. At the tip of the holder 6 that holds the spherical reflector 7, an annular protrusion 6a that protrudes beyond the top of the spherical reflective surface 8 of the spherical reflector 7 is provided. The second annular protrusion 6a serves not only to mechanically protect the spherical reflective surface 8 of the spherical reflector 7, but also to prevent unnecessary light from entering from the outside. At approximately the center of the ultrasonic conductor l,
A support body 11 having a mounting hole 10 in a direction perpendicular to the axis XX is provided. This support 11 may be fitted separately from the ultrasonic conductor l, or may be formed integrally with the ultrasonic conductor l, or a shaft may be provided instead of the mounting hole 10. However, it is desirable to provide the outer peripheral surface of the ultrasonic conductor 1 with anti-reflection means such as a low left to prevent unnecessary reflection of ultrasonic waves.

As shown in FIG. 2, the ophthalmological machine to which this composite eye model is attached is provided with a mounting shaft 13 on a support arm 12 that is mounted approximately horizontally on a post or the like that fixes the subject's face. By fitting the attachment hole 10, the composite model eye can be attached rotatably around the attachment shaft 13.

Therefore, by rotating the composite eye model 180 degrees around the mounting shaft 13, either the ultrasound probe contact surface 2 or the spherical reflective surface 8 can be quickly brought to face the ophthalmological machine.

Usually, in the above-mentioned compound eye f4 machine, the working distance between the eye to be examined and the ophthalmological machine is kept the same in order to be able to quickly shift from corneal measurement to axial length measurement.

Therefore, in FIG. 1, the distance #:S from the ultrasonic probe contact surface 2 to the center of the mounting hole 10 should be set to 1/2 of the distance from the ultrasonic probe contact surface 2 to the apex of the spherical reflective surface 8. For example, there is no need to readjust the working distance using either the ultrasonic probe contact surface 2 or the spherical reflective surface 8, and re-measurement can be performed quickly. Of course, if there is a difference in the remeasured working distances, if the distance faS is set according to the difference, there is no need to readjust the working distances.

In the above-mentioned embodiment, the mounting hole 10 and the mounting shaft 13 were used for mounting, but as shown in FIG. Only the mark 14 is applied, and as shown in FIGS. 4 and 5, the support arm 12 on the side of the ophthalmic machine is equipped with a U-shaped spring support plate 15 that sandwiches the mark 14 so that it can be rotated around an axis 16. In this case as well, the ultrasonic conductor l is rotated around the axis 16, and either the ultrasonic probe contact surface 2 or the spherical reflective surface 8 is directed toward the ophthalmological machine, and the axial length of the eye is adjusted. It can be used for measurement or keratometry.

In addition, in the case of a combination of axial length measurement and keratometry of this composite model eye, the refractive power of the intraocular lens to be calculated according to predetermined conditions, a predetermined empirical formula, etc. is calculated in advance and determined by a predetermined method. If the results are pasted and displayed, it is effective for verifying the calculation function of an ophthalmological measuring machine with similar functions.

[Effects of the Invention] As explained above, in the composite eye model according to the present invention, the ultrasonic conductor for axial length measurement and the spherical reflector for keratometric measurement are connected to one another through a gap that blocks ultrasonic waves. By connecting it along the axis, there is less risk of it being lost because the whole body is integrated into a rod shape, and it has the advantage that both axial length measurement and corneal measurement can be performed with one installation. Also,
By appropriately setting the support point, or turning point, of this composite model eye according to the ophthalmological machine used, it is possible to adjust the working distance for both measurements in one time, making it possible to perform both measurements quickly. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the composite eye model according to the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a sectional view of the attachment means on the ophthalmological machine side, FIG. 3 is a side view of another embodiment, and FIG. The figure is a cross-sectional view of the attachment means, and FIG. 5 is a cross-sectional view taken along the Y--Y line in FIG. 4. 1 is the ultrasonic conductor, 2 is the ultrasonic probe contact surface, and 3 is the ultrasonic probe contact surface.
is an annular protrusion, 4 is an ultrasonic reflecting surface, 5 is a cavity, 6 is a holder, 6a is an annular protrusion, 7 is a spherical reflector, 8 is a spherical reflective surface, 10 is a mounting hole, 11 is a support, 12 is a support arm, 13 is a mounting shaft, 1411F-ri, 15 is a U-shaped support plate,
1G is the axis.

Claims (1)

[Claims] 1. An ultrasonic probe contact surface and an ultrasonic reflecting surface that are substantially perpendicular to the axis are provided at both ends of a rod-shaped ultrasonic conductor, and ultrasonic transmission is blocked at the ends provided with the ultrasonic reflecting surfaces. 1. A composite model eye, characterized in that a spherical reflector is attached through a gap for the spherical reflector, and an optical spherical reflective surface is provided on the surface of the spherical reflector.