Effect of postoperative keratometry on quality of vision in the postoperative period after myopic wavefront‐guided laser in situ keratomileusis. Issue 12 (December 2015)

• Record Type: Journal Article
• Authors: Schallhorn, Steven C.; Venter, Jan A.; Hannan, Stephen J.; Hettinger, Keith A.; Teenan, David
• Is Part Of: Journal of cataract and refractive surgery. Volume 41:Issue 12(2015)
• Publication Date: 2015-12
• Subjects: 617.7
• DOI: 10.1016/j.jcrs.2015.06.034
• Languages: English
• ISSNs: 0886-3350

Abstract

Abstract : Purpose : To determine whether postoperative keratometry is a predictor of patient‐reported satisfaction and night‐vision phenomena after wavefront‐guided myopic laser in situ keratomileusis (LASIK). Setting : Optical Express, Glasgow, United Kingdom. Design : Retrospective case series. Methods : Myopic eyes treated with wavefront‐guided LASIK were analyzed in this study. All patients completed pre‐operative and 1‐month postoperative questionnaires, in which the satisfaction with visual outcomes and pre‐operative and postoperative night‐vision symptoms (glare, halos, starburst, ghosting/double‐vision) were rated. Multivariate regression analysis was performed to determine factors associated with questionnaire outcomes. Results : This study evaluated 8672 myopic eyes of 4602 patients. The mean pre‐operative manifest spherical equivalent was −3.72 diopters (D) ± 2.00 (SD) (range −0.50 to −11.00 D) and the mean pre‐operative keratometry (K) value was 43.64 ± 1.43 D (38.38 to 49.00). At 1 month after surgery, 93.7% and 99.1% of eyes were within 0.50 D and 1.00 D of emmetropia, and 94.6% and 98.3% of eyes achieved monocular and binocular uncorrected‐distance visual acuity(UDVA) of 20/20 or better, respectively. There were 48.7% of eyes that had the flat corneal meridian (minimum K) of 40.0 D or less. Although postoperative keratometry was a significant predictor of patient‐reported satisfaction and the change in halo reports in the regression analysis, its relative contribution was very low and accounted for less than 0.50% of the variance explained by either model. Postoperative keratometry was not a significant predictor of a change in reports of glare, starburst, and ghosting or double vision. Conclusion : In this large cohort of patients, postoperative keratometry played a minimal and clinically insignificant role in predicting post‐LASIK halo visual phenomena and patient‐reported satisfaction. Financial Disclosure : Dr. Schallhorn is a consultant to Abbott Medical Optics and Zeiss and a Global Medical Director for Optical Express. None of the other authors have a financial or proprietary interest in the products and materials presented in this paper.