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Objective, rapid and accurate visual acuity inspection system based on steady-state visual evoked potential

A technology of steady-state visual induction and inspection system, applied in the field of brain-computer interface and optometry optical inspection, can solve the problem of long time, minutes or even ten minutes, etc., and achieve the effect of high accuracy of results

Active Publication Date: 2021-07-09
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] However, the traditional visual evoked potential visual acuity assessment takes a long time, and monocular examination may take several minutes or even tens of minutes due to the presentation of all the spatial frequency gradients of the visual stimulus paradigm

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  • Objective, rapid and accurate visual acuity inspection system based on steady-state visual evoked potential
  • Objective, rapid and accurate visual acuity inspection system based on steady-state visual evoked potential
  • Objective, rapid and accurate visual acuity inspection system based on steady-state visual evoked potential

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] An objective, rapid and accurate inspection system for visual acuity based on steady-state visual evoked potentials, including the following modules:

[0040] 1) Stimulus paradigm design module: use the SSVEP brain-computer interface method, take vertical sine flip grating, vertical square wave flip grating, horizontal sine flip grating, flip checkerboard grid or movement contraction expansion concentric ring as stimulation paradigm, through MATLAB The Psychophysics Toolbox toolbox draws patterns to ensure the stability of SSVEP induced by the stimulus paradigm; in the inspection, select the stimulus paradigm type according to actual needs; the stimulus paradigm is composed of black and white, and its brightness is 80cd / m 2 , the black-and-white contrast is 50%; the spatial frequency of the stimulus paradigm can be adjusted by changing the black-and-white stri...

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Abstract

The invention relates to an objective, rapid and accurate visual acuityinspection system based on steady-state visual evoked potential, which comprises a stimulation normal form design module, an SSVEP signal acquisition, processing and feature recognition module, a spatial frequency gradient presentation module based on maximum likelihood estimation and a visual acuity judgment and feedback module. The gratings, checkerboard grids or concentric rings are used as visual stimulus paradigms, parameters such as time frequency and the like are preset, stimulation normal form spatial frequency parameters of each test are adaptively set through a maximum likelihood method according to a psychophysics visual acuity measurement function, so that accurate evaluation of visual acuity is completed within a short test time, and objective, rapid and accurate examination is provided for visual acuity in ophthalmic examination.

Description

technical field [0001] The invention relates to the technical field of brain-computer interface and ophthalmic optical inspection, in particular to an objective, fast and accurate inspection system for visual acuity based on steady-state visual evoked potentials. Background technique [0002] According to the World Health Organization, 2.2 billion people worldwide are visually impaired, and this trend is likely to increase due to population growth and ageing. Visual acuity test is one of the most basic research tasks in ophthalmology. Common visual acuity tests mainly rely on the subjective feelings and cooperation of the subjects, such as the letter visual acuity scale and the rolling E visual acuity scale. People with communication problems, such as prelingual children or young children, are not suitable for visual acuity assessment by this type of method; adults may also be affected by environmental factors and cause misjudgment; false reporting by the identified person c...

Claims

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Application Information

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IPC IPC(8): A61B3/10
CPCA61B3/10
Inventor 徐光华郑小伟田沛源杜成航
Owner XI AN JIAOTONG UNIV
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