Abstract
Visual evoked potential (VEP) has been used as an alternative method to assess visual acuity objectively, especially in non-verbal infants and adults with low intellectual abilities or malingering. By sweeping the spatial frequency of visual stimuli and recording the corresponding VEP, VEP acuity can be defined by analyzing electroencephalography (EEG) signals. This paper presents a review on the VEP-based visual acuity assessment technique, including a brief overview of the technique, the effects of the parameters of visual stimuli, and signal acquisition and analysis of the VEP acuity test, and a summary of the current clinical applications of the technique. Finally, we discuss the current problems in this research domain and potential future work, which may enable this technique to be used more widely and quickly, deepening the VEP and even electrophysiology research on the detection and diagnosis of visual function.
Highlights
At least 2.2 billion people around the world are living with vision impairment or blindness, and the risk that more people will suffer from vision impairment can increase due to population growth and aging [1,2,3]
This review aims to gather and synthesize evidence to answer these questions: (Q1) What is the typical process of the Visual evoked potential (VEP) visual acuity assessment technique?
VEP acuity increased from 4.5 cpd in the first month to about 20 cpd at 8–13 months
Summary
At least 2.2 billion people around the world are living with vision impairment or blindness, and the risk that more people will suffer from vision impairment can increase due to population growth and aging [1,2,3]. Visual acuity testing is mainly carried out with subjective psychophysical techniques such as letter charts (Sloan letters or Snellen letters) [4,5] and a partially automated method, the Freiburg Visual Acuity and Contrast Test (FrACT) [6]. It is difficult for these subjective methods to assess the visual acuity of examinees with communication problems, such as preverbal children or infants, patients with functional vision problems, those who are mentally disabled, and malingerers [7,8]. By sweeping the spatial frequency of the visual stimulus, e.g., checkerboard or grating, visual acuity can be measured by analyzing the corresponding EEG signals [15]
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