Effect Of Noise On Visual Evoked Potential.

Abstract

Objective – Latency N75 ,P100 and amplitude N75-P100 of recording is affected by various variables like age, refractive errors, eye dominance, sex hormones and the environmental atmosphere. So we tried to evaluate the effect of noise on VEP by using LED goggle as stimulation source. Method – We studied 200 (F=(98 & M=102) healthy volunteers between age 17-22yrs of both sex after fulfilling the exclusion criteria. VEP was recorded for both eye at rest then with noise by a ringing bell placed 10cm from external auditory meatus during recording of VEP of both eye one by one. Evaluation of results done. Result – We found that there was change in latency of N75 and P100 but not statistically significant but there was change in amplitude of N75-P100 for right eye p-Value is 0.0030 and for left eye p-Value is 0.0380 which is statistically significant. Conclusion – The activation of exogenous attention system can change the amplitude response while performing VEP. Result of this study favors that while recording VEP room should be free of disturbing sound and patients are not to be distracted by the examiner too.