Toric intraocular lens power calculation in cataract patients with keratoconus
| Autor: | Ehud I. Assia, Graham D. Barrett, Adi Levy, Guy Kleinmann, Yokrat Ton |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Optics and Photonics
Keratoconus Refractive error medicine.medical_specialty Biometry genetic structures medicine.medical_treatment Intraocular lens Astigmatism Refraction Ocular Cataract Cornea Lens Implantation Intraocular Ophthalmology medicine Humans Dioptre Retrospective Studies Mathematics Lenses Intraocular Phacoemulsification Cataract surgery medicine.disease eye diseases Sensory Systems Lens disorder Surgery Intraocular lens power calculation sense organs |
| Zdroj: | Journal of Cataract and Refractive Surgery. 47:1389-1397 |
| ISSN: | 1873-4502 0886-3350 |
| DOI: | 10.1097/j.jcrs.0000000000000638 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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