Figure 2.

The visual acuity of young men with age of 17 to 23 years in all, urban, and rural areas in the 2012 survey in China. For each age of year, the median with interquartile range of visual acuity was presented. The Spearman correlation analysis showed significant negative correlation between the visual acuity and age among young men in all areas and in rural areas (P < .001 for both left and right eyes). No statistical difference on visual acuity level was found between urban and rural areas (P > .05 for both left and right eyes).