Institutional Review Board (IRB) approval was obtained for this study, and the study adhered to the tenets of the Declaration of Helsinki. This study was conducted at two academic eye centers (Cullen Eye Institute and Casey Eye Institute). Retrospectively, for the dates September 2010 to October 2015, we reviewed consecutive cases of cataract surgery in eyes that had previously undergone RK. Inclusion criteria were eyes that (1) had OCT scans using the RTVue device, (2) had no complications during or after the cataract surgery, and (3) had manifest refraction performed at 3 weeks or later after the cataract surgery with best spectacle-corrected visual acuity of 20/40 or better.
Ocular biometry was measured by using partial coherence interferometry (IOLMaster, V.5.4 and V.7.5; Carl Zeiss Meditec, Inc., Dublin, CA, USA). Optical coherence tomography scans were obtained with the RTVue (version No. 6, 2, 0, 68 to 6, 8, 0, 27). At one center (Baylor College of Medicine), in some cases, corneal curvatures were also measured with the Atlas corneal topography system (Zeiss). All cataract surgeries were performed by one surgeon at the Cullen Eye Institute (DDK) and by six surgeons at the Casey Eye Institute, using a temporal clear corneal incision (except in eyes with 16 or more cuts where limbal incisions were used), phacoemulsification, and implantation of IOLs in the capsular bag. Before the cataract surgery, various methods were used for corneal power estimation and IOL power calculation. The surgeon selected the IOL power to be implanted depending on his judgment. Implanted IOLs included the Alcon lenses (SN60WF and SN6ATT, n = 41; Fort Worth, TX, USA) and the Abbott Medical Optics lenses (ZCB00, ZA9003, and ZCT toric series, n = 54; Santa Ana, CA, USA).