Yu-Cherng Chang1, Florence Cabot, Bianca Maceo Heilman, Larissa Meza, Marco Ruggeri, Arthur Ho, Sonia H Yoo, Jean-Marie Parel, Fabrice Manns. 1. From the Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida (Chang, Cabot, Heilman, Meza, Ruggeri, Ho, Yoo, Parel, Manns); Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, Florida (Chang, Heilman, Meza, Ruggeri, Ho, Yoo, Parel, Manns); Anne Bates Leach Eye Hospital, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida (Cabot, Yoo, Parel); Brien Holden Vision Institute Limited, Sydney, New South Wales, Australia (Ho, Parel).
Abstract
PURPOSE: To determine whether patient-customized paraxial eye models that do not rely on exact ray tracing and do not consider aberrations can accurately predict pseudophakic refraction. SETTING: Bascom Palmer Eye Institute, Miami, Florida. DESIGN: Prospective study. METHODS: Cataract surgery patients with and without a history of refractive surgery were included. Manifest refraction, corneal biometry, and extended-depth optical coherence tomography (OCT) imaging were performed at least 1 month postoperatively. Corneal and OCT biometry were used to create paraxial eye models. The pseudophakic refraction simulated using the eye model was compared with measured refraction to calculate prediction error. RESULTS: 49 eyes of 33 patients were analyzed, of which 12 eyes from 9 patients had previous refractive surgery. In eyes without a history of refractive surgery, the mean prediction error was 0.08 ± 0.33 diopters (D), ranging from -0.56 to 0.79 D, and the mean absolute error was 0.27 ± 0.21 D. 31 eyes were within ±0.5 D, and 36 eyes were within ±0.75 D. In eyes with previous refractive surgery, the mean prediction error was -0.44 ± 0.58 D, ranging from -1.42 to 0.32 D, and the mean absolute error was 0.56 ± 0.46 D. 7 of 12 eyes were within ±0.5 D, 8 within ±0.75 D, and 10 within ±1 D. All eyes were within ±1.5 D. CONCLUSIONS: Accurate calculation of refraction in postcataract surgery patients can be performed using paraxial optics. Measurement uncertainties in ocular biometry are a primary source of residual prediction error.
PURPOSE: To determine whether patient-customized paraxial eye models that do not rely on exact ray tracing and do not consider aberrations can accurately predict pseudophakic refraction. SETTING: Bascom Palmer Eye Institute, Miami, Florida. DESIGN: Prospective study. METHODS: Cataract surgery patients with and without a history of refractive surgery were included. Manifest refraction, corneal biometry, and extended-depth optical coherence tomography (OCT) imaging were performed at least 1 month postoperatively. Corneal and OCT biometry were used to create paraxial eye models. The pseudophakic refraction simulated using the eye model was compared with measured refraction to calculate prediction error. RESULTS: 49 eyes of 33 patients were analyzed, of which 12 eyes from 9 patients had previous refractive surgery. In eyes without a history of refractive surgery, the mean prediction error was 0.08 ± 0.33 diopters (D), ranging from -0.56 to 0.79 D, and the mean absolute error was 0.27 ± 0.21 D. 31 eyes were within ±0.5 D, and 36 eyes were within ±0.75 D. In eyes with previous refractive surgery, the mean prediction error was -0.44 ± 0.58 D, ranging from -1.42 to 0.32 D, and the mean absolute error was 0.56 ± 0.46 D. 7 of 12 eyes were within ±0.5 D, 8 within ±0.75 D, and 10 within ±1 D. All eyes were within ±1.5 D. CONCLUSIONS: Accurate calculation of refraction in postcataract surgery patients can be performed using paraxial optics. Measurement uncertainties in ocular biometry are a primary source of residual prediction error.
Authors: Carmen Canovas; Salome Abenza; Encarna Alcon; Eloy A Villegas; Jose M Marin; Pablo Artal Journal: J Cataract Refract Surg Date: 2012-08 Impact factor: 3.351
Authors: Michael Lawless; James Y Jiang; Chris Hodge; Gerard Sutton; Timothy V Roberts; Graham Barrett Journal: Clin Exp Ophthalmol Date: 2020-04-27 Impact factor: 4.207
Authors: Marco Ruggeri; Stephen R Uhlhorn; Carolina De Freitas; Arthur Ho; Fabrice Manns; Jean-Marie Parel Journal: Biomed Opt Express Date: 2012-06-06 Impact factor: 3.732