Comparison of anterior cortical lens opacity in Epha2+/+ and Epha2+/− mice of different ages. Anterior cortical cataract was examined in groups of 11, 18, 27, 38, 45, and 52-week-old Epha2+/+ and Epha2+/− mice on C57BL/6J background. The bars represent mean cortical cataract grade in each age group. Data from each age group was compared by Mann-Whitney U test. Significant P values are indicated. The group sizes are indicated in the bars. Error bars represent standard error of the mean.