Goniolens and gonioscopy tools

Abstract

The present invention provides a goniolens and gonioscopy tool that can be freely moved on the cornea, thereby allowing for easy adjustment of the viewing angle and direction. [Solution] The goniolens 1 comprises a convex aspherical portion 2 that partially contacts the cornea 11, and a convex spherical portion 3 provided on the opposite side of the aspherical portion 2 for observing the iridocorneal angle 12 through the aspherical portion 2. The iridocorneal angle observation device 6 comprises the goniolens 1 and a holder 5 that holds the goniolens 1.

Description

Technical Field

[0001] The present invention relates to a gonioscope and a gonioscope observation device for observing the corneal angle of the human eye.

Background Art

[0002] Conventionally, various types of such gonioscopes and gonioscope observation devices have been proposed.

[0003] For example, Patent Document 1 discloses a gonioscope having a concave surface with a required radius of curvature for ensuring complete contact with the cornea of the eye and a cut convex surface having a radius of curvature of 8.5 millimeters.

Prior Art Document

Patent Document

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since this gonioscope covers the entire cornea with the concave surface and is used in a fixed state, the gonioscope cannot be tilted or moved, that is, it cannot be freely moved on the cornea, and there is a problem that the desired angle and direction cannot be easily adjusted. [[ID=X]]

[0006] This invention is made based on the above circumstances, and its object is to provide a gonioscope and a gonioscope observation device that can be freely moved on the cornea, so that the desired angle and direction can be easily adjusted.

Means for Solving the Problems

[0007] ​To solve the above problems, the goniolens according to the present invention is characterized by comprising a convex aspherical portion that partially contacts the cornea, and a convex spherical portion provided on the opposite side of the aspherical portion for observing the iridocorneal angle through the aspherical portion.

[0008] Furthermore, the gonioscopy tool according to the present invention is characterized by comprising the goniol lens and a holder for holding the goniol lens. [Effects of the Invention]

[0009] According to the goniolens and gonioscopy device of the present invention, the goniolens can be freely moved on the cornea, thereby allowing for easy adjustment of the desired angle and direction. [Brief explanation of the drawing]

[0010] The drawings illustrate specific embodiments of the present invention, including not only essential components of the invention but also optional and preferred embodiments. [Figure 1] A side view showing a goniolens in a partial cross-section according to one embodiment of the present invention. [Figure 2] A perspective view showing a goniometer-based goniol lensometer-based goniometer- [Figure 3] Cross-sectional view showing the corner observation tool. [Figure 4] A perspective view showing the use of the same corner-viewing tool. [Figure 5] A photograph showing the use of the corner observation tool. [Figure 6] A photograph showing a corner angle observed using the same corner angle observation tool. [Figure 7] Other photographs showing corner angles observed with the same corner angle observation tool. [Figure 8] A photograph showing the fundus of the eye observed non-contact using the same gonioscopy tool. [Figure 9] This diagram shows a comparison between this gonioscope and a conventional gonioscope. [Figure 10] A perspective view showing other uses of the same goniol lens. [Modes for carrying out the invention]

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] In FIGS. 1 and 2, reference numeral 1 indicates a gonioscope according to an embodiment of the present invention.

[0013] One surface of this gonioscope 1 is an aspherical surface 2, and the other surface is a convex spherical surface 3, and the entire convex lens 4 is constituted by the aspherical surface 2 and the spherical surface 3.

[0014] This aspherical surface 2 is formed so as to fit the shape of the cornea 11 and can be partially in contact with the cornea 11.

[0015] In addition, the spherical surface 3 is provided on the side opposite to the aspherical surface 2, and the gonion 12 can be observed through the aspherical surface 2.

[0016] Furthermore, the aspherical surface 2 is formed in a conical shape with a curved top, and the sag H is configured to be 3.5 mm or more.

[0017] This sag H is set in accordance with the average distance from the apex of the cornea 11 to the limbus.

[0018] In addition, the gonioscope 1 is configured such that the focal length as the convex lens 4 is 10 mm or less, and can have a high refractive index and condense light.

[0019] This gonioscope 1 is held by a holder 5, and thus a gonion observation tool 6 including the gonioscope 1 and the holder 5 is constituted.

[0020] As shown in FIG. 3, the gonioscope 1 has a held portion 7 that is held by the holder 5 formed between the aspherical surface 2 and the spherical surface 3.

[0021] The retained portion 7 is formed around the entire circumference between the aspherical portion 2 and the spherical portion 3, and the holder 5 comprises an annular retaining frame 8 that fits onto the retained portion 7, a connecting portion 9 that connects to the retaining frame 8, and a handle portion 10 that connects to the connecting portion 9.

[0022] The connecting portion 9 is constructed using an amorphous metal, such as an amorphous tin alloy.

[0023] The retaining frame 8 may also be constructed using amorphous metal.

[0024] The connecting portion 9 and the handle portion 10 are provided in the opposite direction from the aspherical portion 2 from the holding frame 8.

[0025] This allows the aspherical portion 2 to be partially in contact with the cornea 11, and the angle 12 can be observed from the spherical portion 3 located on the opposite side of the aspherical portion 2.

[0026] Note that 13 is the iris, 14 is the lens, 15 is the aqueous humor, 16 is the eye, 17 is illumination, and 18 is the illumination light.

[0027] With the above configuration, as shown in Figures 4 and 5, the handle 10 can be grasped with the fingers 19 and the aspherical part 2 can be tilted or moved while in contact with the cornea 11.

[0028] In other words, the goniolens 1 can move freely on the cornea 11, allowing for easy adjustment of the viewing angle and direction.

[0029] Therefore, observation from above can also be made possible.

[0030] Furthermore, because the goniolens 1 has an aspherical shape in which the aspherical portion 2 fits (adapts) to the curve of the cornea 11, the field of view can be improved, as shown in Figure 6.

[0031] Furthermore, the goniolens 1 can secure a wide contact surface with the cornea 11 through tilting and movement, and can also illuminate the corner 12 by utilizing the refraction of illumination light 18 and internal reflection within the lens. Moreover, the spherical part 3, which is the observation surface, is spherical and together with the aspherical part 2 forms a convex lens 4 with a short focal length, obtaining a light-gathering effect. As shown in Figure 7, the corner 12 can be observed more brightly.

[0032] For reference, Figure 8 shows the fundus observed non-contact with the cornea 11 using this goniolens 1.

[0033] Furthermore, since the connecting portion 9 of the holder 5 is made of amorphous metal, the goniol lens 1 can be adjusted and fixed to the optimal angle relative to the handgrip portion 10.

[0034] Here, we will explain the differences from conventional products.

[0035] There are two main types of conventional products.

[0036] One type uses the refraction of light and includes a method where light rays are introduced from the opposite side of the cornea by placing the device on top of the cornea (overlay oblique type), and a method where the target angle of the cornea is pressed against the device and viewed from an oblique angle (edge-mounted compression oblique type).

[0037] With the top-mounted, angled type, you need to observe from an angle, and the magnification effect is somewhat weaker.

[0038] Furthermore, with the edge-mounted, pressure-applying, angled type, it is necessary to view it from an angle, the visible area is very narrow, the magnification effect is weak, and it cannot effectively illuminate corners.

[0039] Another type uses a mirror (mirror type), which allows observation from an oblique angle using a mirror.

[0040] Figure 9 shows a comparison between these conventional products and this Goniolens 1.

[0041] Furthermore, as shown in Figure 10, this goniolens 1 can also be used by holding it directly with the fingers without using the holder 5. In this case, it can be freely moved on the cornea 11, allowing for easy adjustment of the viewing angle and direction.

[0042] The disclosure relating to the present invention described above can be summarized to at least the following:

[0043] In other words, the goniolens according to the present invention is characterized by comprising a convex aspherical portion that partially contacts the cornea, and a convex spherical portion provided on the opposite side of the aspherical portion for observing the iridocorneal angle through the aspherical portion.

[0044] Furthermore, the gonioscopy tool according to the present invention is characterized by comprising the goniol lens and a holder for holding the goniol lens.

[0045] The present invention described above may include at least the following embodiments. These embodiments may be adopted separately or in combination with each other.

[0046] (1) The aspherical portion is preferably formed in a conical shape.

[0047] (2) The aspherical portion is preferably configured with a sag of 3.5 mm or more.

[0048] (3) The focal length should preferably be set to 10 mm or less.

[0049] (4) The goniolens preferably has a portion to be held by a holder between the aspherical portion and the spherical portion.

[0050] (5) The retained portion is preferably formed around the entire circumference between the non-spherical portion and the spherical portion, and the holder comprises an annular retaining frame that fits onto the retained portion, a connecting portion that connects to the retaining frame, and a handle portion that connects to the connecting portion.

[0051] (6) The connecting portion is preferably constructed using amorphous metal.

[0052] (7) The amorphous metal is preferably composed of an amorphous tin alloy. [Explanation of Symbols]

[0053] 1 Goniolens 2 Aspherical part 3 Spherical part 5 holders 6. Corner observation tool 7 Part to be held 8 Holding slots 9 Connecting part 10. Handle 11 Cornea 12 corners

Claims

1. A convex aspherical portion that partially contacts the cornea, A convex spherical portion is provided on the opposite side of the aspherical portion for observing the corner angle through the aspherical portion, A goniol lens characterized by having the following features.

2. The goniolens according to claim 1, characterized in that the aspherical portion is formed in a conical shape.

3. The goniol lens according to claim 1, characterized in that the aspherical portion has a sag of 3.5 mm or more.

4. The goniometer lens according to claim 1, characterized in that the focal length is configured to be 10 mm or less.

5. The goniol lens of claim 1, A holder for holding the goniol lens, A corner observation tool characterized by being equipped with the following.

6. The goniolence lens is characterized in that it has a portion to be held by the holder between the aspherical portion and the spherical portion, as described in claim 5.

7. The retained portion is formed around the entire circumference between the aspherical portion and the spherical portion, The corner observation tool according to claim 6, characterized in that the holder comprises an annular holding frame that fits onto the part to be held, a connecting part connected to the holding frame, and a handle connected to the connecting part.

8. The corner observation tool according to claim 7, characterized in that the connecting portion is made of amorphous metal.

9. The corner observation tool according to claim 8, characterized in that the amorphous metal is composed of an amorphous tin alloy.

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