An objective, rapid and accurate inspection system for visual acuity based on steady-state visual evoked potential

Abstract

Steady-state visual evoked potential-based visual acuity objective rapid and accurate inspection system, including stimulus paradigm design module, SSVEP signal acquisition, processing and feature recognition module, spatial frequency gradient presentation module based on maximum likelihood estimation, and visual acuity judgment and feedback The module uses gratings, checkerboard squares or concentric rings as the visual stimulus paradigm, and presets parameters such as time frequency, according to the psychophysical visual acuity measurement function, and adaptively sets the spatial frequency of the stimulus paradigm for each test through the maximum likelihood method Parameters, so that the accurate assessment of visual acuity can be completed in a short test time, providing an objective, fast and accurate inspection of visual acuity in eye examinations.

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...

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