Abstract

Introduction:AC/A ratio is a value of significance in near response & also used to classify&treat abnormal ocular movements.AC/A ratio is determined by Gradient&Heterophoria methods.Normative data for heterophoria method is lacking in Indian population.Objective:This cross sectional study is to generate normative value for AC/A ratio for Indian population by heterophoria method.Materials& Methods:100 adults with no refractive error chosen.After ophthalmic evaluation participants were subjected to AC/A ratio by heterophoria method using 6/9 fixation target&PMMA Prism bar.Results: Participants were with mean age of 25.70 yrs&equal gender distribution. Average phoria at distance was 1.82PD of exophoria&for near at 33 cm was 4.20PD.Mean AC/A ratio by heterophoria method was 5.49PD/D.Conclusion:Previous studies normative data is lesser than the value reached in current study. This variation between gradient&heterophoria method is due to involvement of convergence during heterophoria method