Andrew M J Turnbull1, Warren E Hill, Graham D Barrett. 1. From the Sir Charles Gairdner Hospital (Turnbull), Lions Eye Institute (Barrett), Centre for Ophthalmology and Visual Science, University of Western Australia (Barrett) Perth, Australia; Royal Bournemouth Hospital (Turnbull), Dorset, Optegra Eye Hospital (Turnbull), Hampshire, United Kingdom; Case Western Reserve University (Hill), Cleveland, Ohio, East Valley Ophthalmology (Hill), Mesa, Arizona, USA.
Abstract
PURPOSE: To investigate the accuracy of IOL power calculation methods for refractive targets of myopia compared with emmetropia. SETTING: Lions Eye Institute, Perth, Australia. DESIGN: Retrospective analysis. METHODS: Patients undergoing bilateral, sequential cataract surgery with a plan of modest monovision were analyzed. Target refraction was plano (distance eye) and -1.25 diopters (D) (near eye). Prediction error was determined by comparing the actual postoperative refraction with the predicted postoperative refraction, calculated by the Barrett Universal II (BUII), Hill-RBF version 2.0 (Hill-RBF 2.0), Haigis, Holladay 1, SRK/T, and Hoffer Q formulas. The dataset was divided into distance and near eye subgroups. Mean and median absolute error and percentage of eyes within ±0.25, ±0.50, ±0.75, and ±1.00 D of refractive target were compared. RESULTS: The study included 88 consecutive patients. There was a consistent trend for lower refractive accuracy in the near eyes. BUII and Hill-RBF 2.0 were the most accurate overall and least affected by this phenomenon, with 1 (1.1%) and 4 (4.6%) fewer eyes, respectively, in the near subgroup achieving ±0.50 D of target. Haigis and SRK/T were most affected, with 14 (15.9%) and 11 (12.5%) fewer near eyes achieving ±0.50 D of target (P < .05). Holladay 1 and Hoffer Q occupied the middle ground, with 6 (6.8%) and 9 (10.2%) fewer near eyes achieving ±0.50 D of target. CONCLUSIONS: IOL-power calculation formulas appear to be less accurate when targeting myopia compared with emmetropia. BUII and Hill-RBF 2.0 represented good options when planning pseudophakic monovision as they were least affected by this phenomenon and can be used for both distance and near eyes.
PURPOSE: To investigate the accuracy of IOL power calculation methods for refractive targets of myopia compared with emmetropia. SETTING:Lions Eye Institute, Perth, Australia. DESIGN: Retrospective analysis. METHODS:Patients undergoing bilateral, sequential cataract surgery with a plan of modest monovision were analyzed. Target refraction was plano (distance eye) and -1.25 diopters (D) (near eye). Prediction error was determined by comparing the actual postoperative refraction with the predicted postoperative refraction, calculated by the Barrett Universal II (BUII), Hill-RBF version 2.0 (Hill-RBF 2.0), Haigis, Holladay 1, SRK/T, and Hoffer Q formulas. The dataset was divided into distance and near eye subgroups. Mean and median absolute error and percentage of eyes within ±0.25, ±0.50, ±0.75, and ±1.00 D of refractive target were compared. RESULTS: The study included 88 consecutive patients. There was a consistent trend for lower refractive accuracy in the near eyes. BUII and Hill-RBF 2.0 were the most accurate overall and least affected by this phenomenon, with 1 (1.1%) and 4 (4.6%) fewer eyes, respectively, in the near subgroup achieving ±0.50 D of target. Haigis and SRK/T were most affected, with 14 (15.9%) and 11 (12.5%) fewer near eyes achieving ±0.50 D of target (P < .05). Holladay 1 and Hoffer Q occupied the middle ground, with 6 (6.8%) and 9 (10.2%) fewer near eyes achieving ±0.50 D of target. CONCLUSIONS: IOL-power calculation formulas appear to be less accurate when targeting myopia compared with emmetropia. BUII and Hill-RBF 2.0 represented good options when planning pseudophakic monovision as they were least affected by this phenomenon and can be used for both distance and near eyes.
Authors: Majid Moshirfar; Kathryn M Durnford; Jenna L Jensen; Daniel P Beesley; Telyn S Peterson; Ines M Darquea; Yasmyne C Ronquillo; Phillip C Hoopes Journal: J Clin Med Date: 2022-10-08 Impact factor: 4.964