The aim of the study is to compare head circumference in Gender and then to correlate head circumference with P100 latency, N75-P100 and P100-N145 amplitude. Visual evoked potentials are electrical potential differences recorded from scalp in response to visual stimuli. Numbers of factors that influence VEP waveforms include Age, Sex, Drugs, Head circumference. In the present study head circumference, P100 latency, N75- P100amplitude and P100 -N 145amplitude were recorded in 30 healthy males and 30 healthy females in the age group of 18-25 yrs. It is observed that head circumference is more in males. Also P100 latency is more in males as compared to females which is attributed to longer visual pathway. And amplitudes are larger in females as compared to males which is attributed to genetically determined sex differences in neuro-endocrinological systems. Present__ampersandsignnbsp;study also shows positive correlation between head circumference and latency and negative correlation between head circumference and amplitude. When the latency and amplitude of both males and females of same head circumference (53-55cm) were compared it was found that latency does not show significant results. But amplitude is more in female which is attributed to genetically determined sex differences in neuro-endocrinological systems.