The Patients with Reduced Vision Presenting for Neurophysiological VEP Analysis Most Commonly Show Reduced N75-P100 Amplitude
Journal Title: Scholars Journal of Applied Medical Sciences - Year 2018, Vol 6, Issue 7
Abstract
Study involves analysis of the VEPs of patients who had reduced vision and presented with diverse visual problems. We aimed to retrospectively analyze last 4 yr. VEPs specifically N75-P100 amplitudes and P100 latencies of the affected eye/eyes of the subject. Out of total selected 192 patients the data of 16 subjects was excluded for not being valid (n=12) or subjects not having reduced vision (n=4). The selected 176 patients (128 males and 48 Females) were grouped in to eight age groups of 10 yr. Subjects were assessed for the eye (right, left or both) having reduced vision. N75-P100 amplitude and P100 latency of the subjects were analyzed. Out of 176 patients with males (n=128; mean age 33.5 ± 23.38) and females (n=48; mean age 39.05 ± 24.83) maximum (22.16%, n=39) were of 0-10 yr age group. Both the eyes (LE- n= 60, 34.09 %; RE – n= 52, 29.55 %) were nearly equally affected. Unilateral and bilateral reduced vision was observed in 63.63 % (n=112) and 36.37 % (n=64) patients respectively. Maximum subjects (n=70, 39.77%) showed reduced N75-P100 amplitude. 27 (15.34 %) subjects showed increased P 100 latency and 48 (27.27 %) subjects showed normal VEP. <10 yr age patients more commonly present for assessment of VEPs. Frequency of unilateral involvement in both the eyes is nearly equal; however unilateral affection is more common than bilateral affection. Reduction of N75-P100 amplitude is the most commonly observed abnormal VEP parameter.
Authors and Affiliations
Dr. Gaurav Jain, MD, Dr. Virendra Verma
Keywords
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