Evaluating Refractive Outcomes after Cataract Surgery

Aristodemou, Petros, Sparrow, John M and Kaye, Stephen ORCID: 0000-0003-0390-0592 (2019) Evaluating Refractive Outcomes after Cataract Surgery. Ophthalmology, 126 (1). pp. 13-18.

Text Evaluating Refractive Outcomes after Cataract Surgery. Ophthalmology 2018.pdf - Author Accepted Manuscript Download (209kB)

Abstract

Purpose To compare methods for evaluating refractive outcomes after cataract surgery to detect outliers. Design Case series database study of the evaluation of diagnostic technology. Participants Consecutive patients who had uneventful cataract operations over a 5-year period. Methods The intended and postoperative refractive outcome and differences between these were analyzed as a spherical equivalent, cylinder, and spherocylinder. The average keratometry and differences between steep and flat keratometric meridians were used to calculate the intended refractive error. Main Outcome Measures Outliers were defined as patients for whom the difference between the intended and postoperative refractive errors was more than 3 standard deviations (SDs) away from the mean. Results A total of 9000 patients were included. Twelve patients had missing data and were excluded. The mean intended refractive outcome was −0.12+0.12×2 (95% lower confidence limit [LCL], −1.94+1.06×44; 95% upper confidence limit [UCL], +0.77+1.05×140). The actual postoperative refractive error was −0.30+0.47×6 (95% LCL, −2.36+1.31×36; 95% UCL, +1.00+1.18×148) with a difference from the intended of −0.18+0.35×7 (95% LCL, −1.91+1.22×38; 95% UCL, +0.75+1.09×145). Treating the components of the refractive error independently, outliers were observed in 82 eyes (0.91%) based on the sphere, 46 eyes (0.51%) based on the spherical equivalent, 115 eyes (1.28%) based on treating the cylinder as a scalar, and 76 eyes (0.85%) based on treating the cylinder as a vector. When the differences between the intended and postoperative refractive errors were calculated as a compound spherocylinder, outliers were observed for 233 eyes (2.59%). Conclusions Treating the intended refractive outcome as a spherocylinder improves the precision for detecting clinically significant refractive outliers.

Item Type:	Article
Uncontrolled Keywords:	Cornea, Humans, Refractive Errors, Pseudophakia, Refraction, Ocular, Treatment Outcome, Phacoemulsification, Lens Implantation, Intraocular, Postoperative Period, Biometry, Visual Acuity, Databases, Factual, Aged, Middle Aged, Female, Male, Axial Length, Eye
Depositing User:	Symplectic Admin
Date Deposited:	17 Oct 2018 14:41
Last Modified:	19 Jan 2023 01:14
DOI:	10.1016/j.ophtha.2018.07.009
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3027628