Ptosis effects on intraocular lens power calculation.

Abstract

To evaluate quantitatively ocular biometric parameters and intraocular lens (IOL) power measurements post-ptosis surgery. This study comprised involutional ptosis patients divided into droopy eyelid severity groups: Group 1:>4 mm, Group 2:3-4 mm, and Group 3:1-2 mm. The patients underwent anterior levator resection (ALR), and preoperative and postoperative biometry measurements 3 months postoperatively were obtained. The Group 1 sample size was 19, Group 2 was 22, and Group 3 was 16. The mean K1, K2, and Km values significantly decreased 3 months postoperatively in Group 1 (P<0.001 for all). The mean K1, K2, and Km values non-significantly decreased 3 months postoperatively in Groups 2 and 3 (P>0.05 for all). The mean corneal astigmatism magnitude decreased 3 months postoperatively in Group 1 (P<0.01), Group 2 (P=0.186), and Group 3 (P=0.952). The mean recommended IOL powers targeting emmetropia increased postoperatively in Group 1 and were similar pre- and postoperatively in Groups 2 and 3. In Group 1, the mean changes after ptosis surgery by formula were 0.47 D for SRK/T, 0.52 D for Hoffer Q, 0.55 D for Haigis, 0.50 D for Barrett Universal II and 0.55 D for Holladay 2. Ptosis > 4 mm significantly impacts corneal curvature values and IOL power calculations when cataract surgery is planned. Surgeons might consider altering their lens power choice accordingly if cataract surgery is to be sequentially followed by ptosis repair.