COMPARISON OF FIXATION DISPARITY MEASUREMENTS OBTAINED WITH THE WESSON FIXATION DISPARITY CARD AND THE SHEEDY DISPAROMETER

We compared the fixation disparity measurements obtained with the Disp arometer to those of the Wesson Card. Previous studies suggest that th e measurements obtained by these two instruments gave different result s. The results of previous studies were based on the analysis of poole d data, which may have led to spurious results. Analysis of our data d one in this manner (pooled data) revealed the same findings. However, after analysis of the data based on the separation of subjects accordi ng to phoria (exophoria/esophoria), no statistically significant diffe rence was found between the measurements obtained with the Wesson Card and those with the Disparometer.