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• W3138775413 abstract "In Brief Purpose: Intraocular lens (IOL) power calculation in eyes with keratoconus typically results in hyperopic postoperative refractive error. The purpose of this study was to investigate the visual and refractive outcomes in patients with keratoconus having cataract surgery with a toric IOL and compare IOL power calculation accuracy of conventional formulas and keratoconus-specific formulas. Setting: Ein-Tal Eye Center, Tel-Aviv, Israel. Design: Retrospective case-series study. Methods: Postoperative visual acuity and manifest refraction were examined. The error in predicted refraction and IOL power calculation accuracy within a range of 0.50 to 2.00 diopters (D) were compared between different IOL calculating formulas. Results: 32 eyes with keratoconus were included. Visual acuity improved in all cases, and subjective astigmatism decreased from −2.95 ± 2.10 D to −0.95 ± 0.80 D (P < .001). The mean absolute errors were as follows: Barrett True-K formula for keratoconus with measured or predicted posterior corneal power, 0.34 D; Barrett Universal II formula, 0.64 D; Kane formula, 0.69 D; Kane formula for keratoconus, 0.49 D; SRK/T formula, 0.56 D; Haigis formula, 0.72 D; Holladay 1 formula, 0.71 D, and Hoffer Q formula, 0.87 D. Barrett True-K formula with measured posterior corneal power, SRK/T formula, and Kane formula for keratoconus resulted in a prediction error within ±0.50 D of 87.5%, 59.4%, and 53.1%, respectively. Conclusions: Cataract removal with a toric IOL significantly improves visual acuity and decreases astigmatism in keratoconic eyes with a topographic central relatively regular astigmatic component. Keratoconus-specific formulas resulted in lower mean error in predicted refraction compared with conventional calculating formulas. Using the posterior corneal power within the Barrett True-K formula for keratoconus improved IOL power prediction accuracy. IOL power calculation typically results in a hyperopic outcome in patients with keratoconus. The Barrett True-K Formula for keratoconus improves refraction prediction by incorporating the posterior corneal power into calculation." @default.
• W3138775413 created "2021-03-29" @default.
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• W3138775413 date "2021-11-01" @default.
• W3138775413 modified "2023-10-01" @default.
• W3138775413 title "Toric intraocular lens power calculation in cataract patients with keratoconus" @default.
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• W3138775413 doi "https://doi.org/10.1097/j.jcrs.0000000000000638" @default.
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