Purpose: To compare refractive outcomes using fellow-eye postoperative anterior chamber depth (ACD) in intraocular lens (IOL) power calculations with outcomes obtained without fellow-eye data and to assess postoperative ACD stability.
Setting: Johns Hopkins University, Baltimore, Maryland, USA.
Design: Consecutive case series.
Methods: The main outcome measures were the optimized median absolute error (MedAE) and ACD at postoperative day 1 and postoperative month 1 measured by optical biometry. A program using the Olsen IOL power formula predicted the postoperative ACD and refractive outcomes and calculated theoretical refractive outcomes of inputting fellow-eye ACD at postoperative day 1 and postoperative month 1. Theoretical results were subtracted from the observed manifest refraction and then optimized. Calculations were repeated for the other eye.
Results: In 102 paired eyes, the MedAE was 0.32 diopter (D) (interquartile range, 25% to 75%; range 0.12 to 0.54 D) for Olsen (without fellow-eye data), 0.33 D (range 0.20 to 0.57 D) using fellow-eye postoperative day 1 ACD, and 0.28 D (range 0.13 to 0.51 D) using fellow-eye postoperative month 1 ACD, with a significant difference between the latter 2 MedAE values (P < .0005). In eyes with an Olsen absolute error greater than 0.50 D, use of either ACD in the fellow eye resulted in a smaller MedAE (P ≤ .01). The ACD shallowed by a mean of 148 μm ± 13 (SD).
Conclusions: Use of the fellow-eye postoperative month 1 ACD predicted refractive outcomes better than postoperative day 1 ACD. In eyes with a larger Olsen absolute error, use of either postoperative ACD from the fellow eye would have yielded better results.
Financial disclosure: No author has a financial or proprietary interest in any material or method mentioned.
Copyright © 2015 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.