Apparatus for measuring phoria and method of measuring phoria using the same

A technology of phoria and equipment, which is applied in the field of optometry tools, can solve complex, unplaceable, expensive and other problems, and achieve the effect of improving efficacy

Active Publication Date: 2020-07-28
ESSILOR INT CIE GEN DOPTIQUE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This introduces experimental error due to the use of a trial frame, as the test is usually held by the subject and cannot be placed at a precise distance
[0010] In this regard, the determination of myopic strabismus under different accommodation conditions requires complex and expensive equipment (plethoptics, trial frames) and skilled technicians using them
However, measurement / testing in the field lacks precision as the distance to the near target is not fixed (adjusted each time by the staff)
Also, measuring phoria is time consuming due to lens changes, especially with trial frames

Method used

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  • Apparatus for measuring phoria and method of measuring phoria using the same
  • Apparatus for measuring phoria and method of measuring phoria using the same
  • Apparatus for measuring phoria and method of measuring phoria using the same

Examples

Experimental program
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Effect test

no. 1 example

[0060] According to this first embodiment, the device can be used to measure horizontal phoria under different accommodation conditions by the following steps:

[0061] 1. Wheel 5 is set with no power lens or an empty position where no lens is provided for the subject's left eye.

[0062] 2. Ask the subject to look through the opening in the device with the light fixed in the center of the scale. With his left eye he will see scales and lights, and with his right eye he will see a vertical line thanks to the Maddox rod.

[0063] 3. The task is to read on which scale the vertical line is located (the value of its phoria without the multifocal lens), and report it to the examiner.

[0064] 4. Wheel 5 turns to the multi-focal lens, among which, one of the following three modes can be adapted: (1) increasing power: +1D, +1.5D, +2D, etc.; (2) decreasing power: +3D, +2.5 D, etc.; (3) random order.

[0065] 5. Repeat Step 2, Step 3, and Step 4 and write down the values ​​until all...

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PUM

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Abstract

A device for measuring phoria comprising: a front side (1), which comprises an opening (11) corresponding to the position of the eyes of the subject; a rear side (2), which is parallel to the front side (1) and presents a visual display pattern (21) disposed towards the front side (1) and configured to be utilized in the phoria measurement, and; optical means (5), which contain at least one set of lenses with different powers corresponding to different accommodation demands of the subject, wherein the optical means (5) are positioned corresponding to the opening (11) and in front of at least one eye of the subject, so that the visual display patterns (21) are adapted to be viewed by the subject through the optical means (5). The device provides cheap, simple, fast and precise way to measure phoria under different accommodation values.

Description

technical field [0001] The present invention relates generally to optometry tools, and in particular to an apparatus for measuring phoria. Furthermore, the invention relates to a method of measuring phoria using the device. Background technique [0002] Comprehensive refraction usually refers to the measurement of monocular parameters, such as the degree of nearsightedness, farsightedness, astigmatism and presbyopia. However, in order to obtain a comprehensive prescription, it is also necessary to measure the value of binocular vision, especially phoria (proper strabismus), which can be used for advanced and personalized eyeglass prescriptions, such as for determining the near addition value of ophthalmic progressive lenses. [0003] Specifically, phoria is an eye condition in which the eyes point in directions that do not coincide with each other in the resting position when binocular vision fusion is not taking place. People with two normal eyes have (usually) monovision...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/08
CPCA61B3/032A61B3/04A61B3/08
Inventor 保金华布约恩·德罗贝余新平苏彬彬吴戈陈浩
Owner ESSILOR INT CIE GEN DOPTIQUE
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