Characteristics of Pattern Visual Evoked Potential in Two Eyes with Varying Visual Acuity in One Eye and Forensic Application

• Published in: Current medical science Vol. 38; no. 2; pp. 342 - 348
• Main Authors: Jia, Fu-quan, Liang, Yu-guang, Zhang, Xin-yuan, Luo, Fang-liang, Xiong, Yan-he, Cheng, Long-long, Liu, Ji-hui
• Format: Journal Article
• Language: English
• Published: Wuhan Huazhong University of Science and Technology 01.04.2018; School of Forensic Medicine, China Medical University, Shenyang 110122, China; Beijing Scales Forensic Center, Beijing 100025, China%School of Forensic Medicine, China Medical University, Shenyang 110122, China; Department of Forensic Medicine, Inner Mongolia Medical University, Hohhot 010059, China%School of Forensic Medicine, China Medical University, Shenyang 110122, China
• Subjects: Medicine; Medicine & Public Health; forensics; two eyes; decline in visual acuity; visual evoked potential
• ISSN: 2096-5230; 2523-899X; 1672-0733; 2523-899X
• DOI: 10.1007/s11596-018-1885-2

Summary In this study, we aimed to study the pattern visual evoked potentials (P-VEPs) in two eyes with varying visual acuity in one eye and to provide an objective estimation of visual acuity by comparing P-VEPs in one and two eyes. Thirty subjects were chosen, who had one eye with an acuity of 5.0, 4.85, 4.6, 4.0, or scieropia and obstructed vision and the other eye with an acuity of 5.0, respectively. P-VEPs were detected under the large grating stimuli at 3×4 spatial frequency, moderate grating stimuli (12×16 spatial frequency) and small grating stimuli (48×64 spatial frequency). Under large grating stimuli, there was no significant difference in P100 peak latency between the groups, nor was there a significant difference between the amplitude of two eyes and the amplitude of one normal-vision eye. Under moderate and small grating stimuli, there was a significant difference in P100 peak latency between the group with both eyes having an acuity of 5.0 and the group with visual acuity below 4.0 in one eye. There was a significant difference in P100 amplitude between the group with visual acuity of 5.0 in both eyes and the group with one normal-vision eye. There was no significant difference in the amplitude of two eyes and the amplitude of one normal-vision eye between any other two groups. In forensic identification, characteristics and variability of P-VEPs in one and two eyes can be used to identify malingering or decline in visual acuity.