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(A) Preoperative best corrected acuity (group A = 75, group B = 94); (B) preoperative acuity without co-morbidity (group A = 66, group B = 93); (C) postoperative acuity without co-morbidity. Acuity key: 6/5 = 1; 6/6 = 2; 6/9 = 3; 6/12 = 4; 6/18 = 5; 6/24 = 6; 6/36 = 7; 6/60 = 8; 2/60 = 9; <2/60 = 10.
