Electroencephalogram signal-based visual acuity evaluation system and method thereof

Abstract

The invention discloses an electroencephalogram signal-based visual acuity evaluation system and a method thereof. The system evaluates visual acuity by using electroencephalogram signals to obtain more objective and accurate evaluation results. VR glasses are used to effectively reduce influence from external ambient light. Sighting marks are automatically switched according to the effective signal duration, thereby achieving automation of sighting mark switching and synchronization of the sighting marks and the signals. Therefore, the single-electrode electroencephalogram signal acquisition device is more simple in operation and lower in cost. A signal processing module is used for processing background signals so as to reduce influence of individual difference and environment change on evaluation results, and allow the system to be applied in examination of daily visual acuity. After a data analysis module obtains visual acuity results through the first evaluation, the abnormal results are eliminated by calculating the relative standard deviation followed by the secondary evaluation, so that the evaluation results are more accurate. The data analysis module collects each of analysis results to back to a database, thereby perfecting eyesight judgment method with electroencephalogram signals, and improving judgment accuracy in the next examination.

Description

technical field [0001] The invention relates to the technical field of visual acuity evaluation, in particular to a visual acuity evaluation system and method based on electroencephalogram signals. Background technique [0002] With the frequent use of long-term close-range eyes and a large number of terminal screen electronic products, the vision of children and adolescents is greatly affected. In 2020, the overall myopia rate of children and adolescents in my country is 52.7%, and the myopia rate of high school students reaches 80.5%. . Facing the ever-increasing myopia rate among teenagers, myopia prevention and control has become very important, and vision (visual acuity) examination, as a necessary part of myopia prevention and control, needs to be intelligent and popularized to improve the efficiency of vision screening. The traditional visual inspection method is the eye chart inspection method, which is a subjective inspection and requires the full understanding and ...

AI Technical Summary

Problems solved by technology

However, there are many defects in using VEP and SSVEP EEG signals for vision screening: (1) The signal acquisition equipment of VEP and SSVEP has high cost and complicated operation

(2) In the literature [2], the visual stimulation paradigm is displayed on the LCD screen, but there is still the influence of external ambient light on the experimental subjects.

(3) In literature [1] and [2], when using EEG signals for visual acuity analysis, the data generated in strict experimental environments are used, and there is a lack of EEG signals generated in different environments and different groups of people. Individual differences in handling, difficult to use in routine visual acuity checks

(4) There is a lack of database modules in literature [1] and [2], new data should be included in the database, and the visual acuity test method should be revised

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