Evaluating changes in apparent chord mu after pharmacological pupil dilatation

Introduction: Preoperative measurements of apparent chord mu length above 0.6 mm have been associated with higher risks for photic phenomena after cataract surgery with multifocal intraocular lenses (MFIOLs). Methods: This retrospective study evaluated patients scheduled for elective cataract surgery at a single tertiary medical center between 2021-2022. Pupil diameter and apparent chord mu length were analyzed for eyes with biometry measurements from IOLMaster 700 (Carl Zeiss Meditec, AG) under photop ic light conditions, before and after pharmacological pupil dilatation. Exclusion criteria were visual acuity worse than 20/100, prior intraocular surgery, refractive surgery, iris related procedures or pupil abnormalities affecting dilatation. Apparent chord mu lengths before and after pupil dilata tion were compared. In addition, multivariate linear regression analysis, using a stepwise method, was conducted to assess possible predictors of apparent chord values. Results: Included were 87 eyes of 87 patients. Mean Chord mu length increased after pupillary dilatation from 0.32 ± 0.17 mm to 0.41 ± 0.17 mm for right eyes (p
Source: Ophthalmic Research - Category: Opthalmology Source Type: research