Fig. 4

Corneal astigmatism and age in our cohort. (A) Prevalence of “with-the-rule” (WTR), “against-the-rule” (ATR) and “oblique” (OBL) astigmatism in different age groups. (B) Comparison of the three types of astigmatism between patients aged 40 to 60 with a history of refractive surgery (RS) and those in the same age range without such a history (NRS).