A study on the relationship between visual acuity and the latency and spatial fequency of P100 of pattern reversal visual evoked potentials in a view of forensic science / 中国法医学杂志

ABSTRACT

Objective To investigate the relationship between the parameter of P100 elicited by pattern stimuli, spatial frequency and visual acuity in the posttraumatic eyes. Methods 81 eyes sustained blunt injury in outpatients were enrolled from West China Hospital, Sichuan University. The control group was composed of 199 eyes without disease or trauma. Different P100 wave including amplitude and latency were recorded in each eye stimulated by reversal pattern with 5 - sized checkerboards. The data were processed by SPSS to describe the relationship between the visual acuity and the parameter of P100 wave. A linear and regression analysis was done in the statistic procedure. Results There was a high correlation between spatial frequency ( X) and the log visual acuity ( Y). Regression equations were deduced for evaluating the visual acuity. There was a correlation between the latency of P100 wave (X) and the log visual acuity (Y) in all the examined eyes. Conclusion The established regression equations can be used to evaluate the visual acuity as an accurate and objective method. There is a promising future of its application in the forensic clinical authentication of visual function.