An Analytical Study on Intraocular Lens Power Calculation Using Different Formulas Before and After Upper Eyelid Blepharoplasty in Patients with Visual Field Defects Due to Dermatochalasis

Objective: This study aims to evaluate the changes in intraocular lens (IOL) power calculations using different formulas before and after upper eyelid blepharoplasty in patients with visual field defects due to dermatochalasis. Material and Methods: A total of 166 eyes from 166 patients with superior visual field narrowing due to dermatochalasis were included in this prospective study. Keratometric measurements and IOL power calculations were assessed at baseline and during postoperative follow-ups using Nidek optical biometry (ALScan, Nidek Co., Ltd., Japan). Results: The study included 166 eyes of 166 patients, 85.5% of whom were female and 14,5% male. The mean age of females was 56.80±9.73 years (range 37-78), and for males, it was 55,91±7.95 years (range 44-68). There were no significant differences in the measurements of average and steepest corneal curvature or corneal astigmatism (p>0.05). However, significant differences were found in the IOL power calculations using different formulas [SandersRetzlaff-Kraff-Theoretical (SRT-T), Hoffer, Holladay, and Haigis] before and after surgery (p<0.000). Conclusion: To the best of our knowledge, the current study is the first to explore this topic with multiple IOL formulas and a larger sample size.