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목적 : To compare the accuracy of intraocular lens (IOL) power calculation based on standard keratometry (K) and the new total keratometry (TK) obtained from next-generation biometrics (IOLMaster® 700; Carl Zeiss Meditec, Oberkochen, Germany) in vitrectomized eyes or eyes undergoing combined phaco-vitrectomy.
방법 : Patients undergoing cataract surgery after previous vitrectomy or combined phaco-vitrectomy from Gangnam Severance Hospital (Yonsei University College of Medicine) between September 2018 and August 2019 were retrospectively reviewed. Only those eyes with successful in-the-bag placement of IOL were included. The absolute prediction error (APE) of spherical equivalence was calculated based on K and TK (including posterior corneal surface and pachymetry) and compared at 1-month post-operation using the classic IOL calculation (SRK/T) and the new formula (Barrett TK Universal II).
결과 : Thirty-three eyes (33 patients, mean age 67.7 years, mean axial length 23.7mm) were included: 2 eyes (6%) with previous vitrectomy and 31 eyes (94%) undergoing combined surgery. The most common diagnosis was epiretinal membrane (17 eyes, 52%); a 1-piece monofocal IOL (Tecnis ZCB00; Johnson&Johnson, CA, USA) was most commonly used (20 eyes, 61%). The mean APE was 0.61±0.7 diopters (D) (range 0.02-2.80) for SRK/T and 0.18±0.3 (0-0.7) for Barrett TK Universal II (P=0.01, Wilcoxon test). APE was within ±0.25 D in 36% of SRK/T versus 80% in Barrett TK Universal II (P=0.028, McNemar test).
결론 : In vitrectomized eyes, a higher prediction accuracy can be expected from the newer Barrett TK Universal II using next-generation biometrics compared to the standard K used by the classic SRK/T formula.
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