JPH0373296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a test lens for an optometric test frame. Specifically, the present invention relates to a test lens for an optometry test frame, which is suitable for, for example, eye exams in which progressive multifocal lenses for distance and near vision are worn simultaneously.

[Prior art] Conventionally, commonly used test lenses and test frames with a diameter of 35 mm have a narrow field of view, and are difficult to use in optical examinations for progressive multifocal lenses, strabismus and strabismus, and severe myopia and astigmatism. The visual range from the center is narrow, making it difficult to test whether or not glasses can be worn when using glasses, and it is difficult to fix the angle of the optical axis for astigmatism, strabismus, and oblique vision.

As a result of continuing research on this point, the present inventor discovered the following. In other words, in the case of simultaneous testing of progressive multifocal lenses for distance and near vision (varies slightly depending on the manufacturer), as shown in Figure 1, the vertical width of the distance vision and near vision viewpoints is at a position of 18 mm to 20 mm, so the test lens It was also found that the viewpoint of the test frame requires at least 20 mm to 23 mm from the optical center.
This fact means that it is difficult to perform eye examination while wearing a progressive multifocal lens for distance and near vision using conventional test lenses for examination. I would like to add an additional comment on this point. Fig. 1 is an explanatory diagram of a multifocal lens, where 1 is the geometric center (prism measurement position), 2 is the fitting point, 3 is the marking line, 4 is the horizontal reference line, 5A and 5B hidden marks, 5A is ρ mark, 5B is
This is the ADD display mark. 6 is a scribble mark, 7
is a mark to distinguish between left and right. 8 indicates a distance power measurement position, and 9 indicates a near power measurement position. When A length or diameter is 72mm (or 68mm), B length is 16
mm, C length 2 mm, D length 5 mm, E length 34 mm, and F length 3 mm, so distance power measurement position 8
The vertical width between this and the near power measurement position 9 is 18 mm to 20 mm. Therefore, it is understood that the viewpoint of the optometric test lens and the optometric test frame needs to be at least 20 mm to 23 mm from the geometric center (prism measurement position) 1. That is, with the conventional 35 mm diameter optometry test lens and optometry test frame, it is difficult to simultaneously wear a progressive multifocal lens for distance and near vision.

On the other hand, conventional optometry test frames have a diameter of 35 mm, and the optometry test lenses are fixed using springs. With this conventional fixation method using springs, the rotation angle of the shaft is limited to 130° to 140°, so it is possible to fix the shaft in impossible or difficult positions due to shaft angles such as oblique astigmatism, oblique obliqueness, and strabismus. The position is correct. In this regard, JP-A-54-133791 discloses an optometry test frame that has a wide rotation axis angle for the optometry test lens and allows simultaneous eye examination while wearing progressive multifocal lenses for distance and near vision. Since cushioning material is used as a temporary fixing means for the lens, it not only lacks durability but also has the risk of rotating due to the slightest movement of the subject during the test, especially for wide-angle test lenses with a diameter of 45 mm or more. In some cases, even a slight rotation of 1 to 2 degrees caused misdiagnosis.

[Object of the Invention] Therefore, an object of the present invention is to provide a test lens for an optometry test frame, which is suitable for eye examinations in which progressive multifocal lenses for distance and near vision are worn simultaneously.

Another object of the present invention is to provide a test lens for an optometric test frame, which can be fixed to an optometric test frame using a magnetic type.

Other objects of the invention will become apparent from the following description of the specification.

[Summary of the Invention] As a result of intensive research, the present inventor has developed a method for inspecting progressive multifocal lenses, inspecting strabismus/strabismus, or detecting nearsightedness/strabismus.
For optometry test lenses that are temporarily fixed at an angle of 180° or more at the fixing point to the optometry test frame when performing eye examinations for astigmatism, etc., materials that have an angle of adjustment of approximately 45 mm or more in diameter and that are attracted to magnets are used. The present inventors have discovered that the above object can be achieved by having an annular ream formed of .

[Structure of the invention] The present invention will be explained in more detail below.

FIG. 2 is an explanatory diagram showing the optometry test lens of the present invention, in which 10 is the wide-angle lens of the present invention;
1 indicates the lens body, and 12 indicates the annular rim. The lens body 11 has a diameter of about 45 mm,
The annular ream 12 is made of a material that is attracted to a magnet, such as iron or iron alloy.

In the wide-angle lens 10 of the present invention, when the optometric test frame is attached (corresponding to when the optometric test frame is attached), the distance G between the optical center O1 of the lens body 11 and the corneal apex O2 of the eye to be examined is approximately 12 mm. The optometry test lens in such a position has a viewing angle θ of approximately 100 to 120 degrees, and may or may not be wearable due to distortions caused by the lens aberrations 13 such as nearsightedness, farsightedness, astigmatism, strabismus, and strabismus, and distortions caused by the prism lens. It is possible to quickly determine whether it is possible.

Furthermore, if used in combination with the magnetic type optometry test frame described below, it is easy to simultaneously wear a progressive multifocal lens for distance and near vision.

FIG. 3 is a front view of an optometric test frame suitable for use in combination with the test lens according to the present invention, and FIG. 4 is a sectional view taken along the line -- in FIG. 3.

The optometry test frame 14 includes an annular cover 18 having a lower notch 17 at a desired interval (for example, 4 mm) on an annular main body 16 having a notch 15 on the lower side, and a, b, and c. It is fixed to the annular main body portion 16 at three points.

Permanent magnets 19 are fixed to the fixed points a, b, and c, and can attract and fix the annular rim 12 of the optometric test lens.

The optometry test lens storage section having the above-mentioned fixing means using the permanent magnet 19 has an annular body section 16.
It is preferable that the annular main body portion 16 be provided before and after the annular main body portion 16 so that at least two annular main body portions 16 can be inspected (see FIG. 4).

One or more permanent magnets 19 may be provided, and the entire test frame may be made of magnets 19. Further, the angle θ formed by the fixed point is 180° or more as in the illustrated embodiment. Note that the notch portion and the notch portion 17 are not necessarily necessary, and the annular main body portion 16 and/or the annular cover 18 may be annular itself.

[Operation of the Invention] The optometric test lens 10 of the present invention is stored and used as shown by the imaginary line in FIG. 4. By holding the knob attached to the annular ream 12 and turning it as in the conventional manner, the optometry test lens 10 can be freely rotated over an angle of 180 degrees. If a combination with a type optometry test frame is adopted, it can be fixed at any position by the action of the annular ream 12 made of a material that attracts magnets and the permanent magnet 19.

[Effects of the Invention] According to the present invention, when inspecting progressive multifocal lenses, inspecting strabismus and diaphoresis, or inspecting eyes for myopia and astigmatism, the angle 180 formed by the fixed point with respect to the optometry test frame is An optometry test lens that is temporarily fixed at a temperature of 45 mm or more has a diameter of about 45 mm or more, and has an annular rim made of a material that attracts magnets, so it can achieve the above purpose and It can be used in combination with an optometry test frame, and the magnetic fixing method allows it to rotate over 180 degrees, making it easy to position the optical axis at a specified angle. , it is possible to easily and quickly find out whether it is possible to use lenses due to distortion due to lens aberration in tests for severe myopia, astigmatism, strabismus, strabismus, etc. This has the great effect of greatly reducing the disparity in the feeling of wearing glasses and enabling more accurate visual acuity tests.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a multifocal lens, FIG. 2 is an explanatory diagram showing an optometric test lens of the present invention, and FIG. 3 is a diagram suitable for use in combination with the optometric test lens of the present invention. FIG. 4 is a front view of the optometry test frame, and FIG. 4 is a sectional view taken along the line -- in FIG. In the figure, 1 is the geometric center (prism measurement position), 2
is the fitting point, 3 is the scribing line, 4 is the horizontal reference line, 5A is the ρ mark, 5B is the ADD display mark, 6 is the scribing mark, 7 is the left and right distinction mark, 8 is the distance power measurement position, 9 is a near power measurement position, 10 is a wide-angle lens of the present invention, 11 is a lens body, 12 is an annular rim, 13 is a lens aberration section, 1
4 is an optometry test frame, 15 is a notch, 16
17 indicates an annular main body, 17 indicates a notch, 18 indicates an annular cover, and 19 indicates a permanent magnet.

Claims (1)

[Claims] 1 An optometry test in which the fixation point is temporarily fixed at an angle of 180° or more to the optometry test frame when inspecting progressive multifocal lenses, testing for strabismus/strabismus, or performing optometry for myopia/astigmatism, etc. A test lens for an optometry test frame, characterized in that the lens has a wide angle with a diameter of about 45 mm or more and an annular rim made of a material that attracts to a magnet.