Table for measuring accommodation dynamics

Abstract

The test chart for measuring accommodation dynamics is characterized by the fact that it permanently ensures that each of the two eyes has a clear view of the complete text.

Description

[0001] Accommodation is the ability to adjust the refractive power of the eye(s) (the brain controls the accommodation of the dominant eye, while the non-dominant eye receives the same accommodative impulses as the dominant eye) to the distance of the current stimulus. The control of accommodation is an innate ability, the quality of which is acquired. How well an individual controls their accommodation depends on the quality of their vergence and, particularly during the period of qualitative development, on the stage of their overall development.

[0002] Accommodation dynamics (flexibility of accommodation) is the ability to repeatedly focus on objects at different distances in the eye.

[0003] Accommodation dynamics are measured using an object (usually text) at a stable distance of 40 cm. The change in accommodation is induced by alternately using plus and minus lenses, each with a power of 2 diopters. The moment the subject reports seeing the test object clearly through the currently used lenses, the lenses with the opposite sign are switched. The number of complete lens changes (one cycle consisting of the correction of the plus and minus power) performed by the client is counted within 60 seconds.

[0004] One cycle: both lenses + 2.0° leading => object is in focus => lens change => both lenses - 2.0° leading => object is in focus

[0005] Due to the accommodation requirement, the measurement is only performed in the pre-presbyopic age. Monocular and binocular measurement

[0006] Monocular measurement of accommodation dynamics measures the flexibility of accommodation and the awareness of sharpness or blurriness.

[0007] In binocular measurement, vergence also influences the measurement result. Binocularly, the interplay of accommodation, vergence, and focus perception is measured.

[0008] Current literature on optometry [1] and [2] describes the difference between monocular and binocular measurement of accommodation dynamics. However, it lacks any explanation of how binocular measurement is ensured to be truly binocular. [1] Dietze, Holger; Paul H. Artes; Hans-Jürgen Grein; Hendrik Jungnickel; Sebastian Marx; Dirk Seidel; Wolfgang Sickenberger; Frank Spors: The Optometric Examination. 3rd ed. Stuttgart: Thieme, 2024 - Pages 157-158 [2] Friedrich, Michaela; Stephan Degle; Hans-Jürgen Grein: Optometric Functional Tests. Heidelberg: DOZ Verlag, 2011 - Pages 102-110

[0009] All previous methods in functional optometry using BarReader foils are designed to ensure that any type of suppression is detected during the measurement. Depending on the BarReader type, the client wears either red / green glasses or polarized glasses as the analyzer during the measurement. The BarReaders are designed so that text behind a strip can be seen either with the right eye only, the left eye only, or with both eyes. Binocularity is maintained as long as the entire text can be seen.

[0010] The problem with the current method using the BarReader is that the client has to indicate immediately when they see the text clearly. The text appears with significantly different contrasts depending on which stripe the client focuses their attention on. The text behind the clear stripes is much easier to judge in terms of sharpness than the text behind the colored stripes. This also applies to BarReaders with polarizing stripes. With BarReaders, the client has more difficulty precisely controlling their accommodation than with text without a BarReader.

[0011] According to the invention, the new test panel creates ( Fig. 1) to measure accommodation dynamics.

[0012] According to the invention, the client wearing analyzer glasses can see the entire text with both eyes at all times. Only the smiley faces on the right and left sides of the text are behind polarizing filters and are therefore visible to only one eye at a time. With V-shaped polarization, the right eye sees three smiley faces on the left and the left eye sees two on the right. As long as binocular vision is used, the subject sees five smiley faces.

[0013] This ensures that the entire text is constantly visible to every eye. The client can better control and assess the text's sharpness. The text's permanent visibility increases the measurement's reliability.

[0014] According to the invention, the strip with the text can be pulled out of the holder and replaced with different text. This allows the test chart to be equipped with either child-friendly optotypes or regular text (even in different languages), depending on requirements. The text size and the child-friendly optotypes correspond to a visual acuity of 0.8.

[0015] Fig. Figure 1 shows the schematic representation of the new test. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] Dietze, Holger; Paul H. Artes; Hans-Jürgen Grein; Hendrik Jungnickel; Sebastian Marx; Dirk Seidel; Wolfgang Sickenberger; Frank Spors: The Optometric Examination. 3rd ed. Stuttgart: Thieme, 2024 - Pages 157-158

[0008] Friedrich, Michaela; Stephan Degle; Hans-Jürgen Grein: Optometric Functional Tests. Heidelberg: DOZ Verlag, 2011 - Pages 102-110

[0008]

Claims

[1] The test chart for measuring accommodation dynamics, characterized by that this permanently ensures each of the two eyes has a clear view of the entire text. [2] Measurement of the accommodation dynamics according to claim 1, characterized by , that the lateral smileys ensure safe suppression control without irritating central vision. [3] Measurement of the accommodation dynamics according to claim 1, characterized by , that the interchangeable text strips ensure that the board can also be used by illiterate people, people with different native languages ​​and children who are still learning to write.

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