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Comparison of Hill‐radial basis function, Barrett Universal and current third generation formulas for the calculation of intraocular lens power during cataract surgery
Author(s) -
Roberts Timothy V,
Hodge Chris,
Sutton Gerard,
Lawless Michael
Publication year - 2018
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/ceo.13034
Subject(s) - intraocular lens power calculation , intraocular lens , medicine , ophthalmology , phacoemulsification , refractive error , cataract surgery , multifocal intraocular lens , refraction , lens (geology) , optometry , optics , cornea , visual acuity , physics , keratometer
Importance This study represents a novel comparison of recently introduced intraocular lens power calculation formulas. Background To compare current new generation formulas for calculating the intraocular lens power for a standard cohort of patients undergoing cataract and lens replacement surgery in a private group practice in Australia. Design Retrospective case series comparison. Participants Postoperative results from 400 consecutive patients undergoing implantation of an SN60WF intraocular lens post cataract removal by 12 surgeons were used. Methods Refractive outcomes were compared with expected targets to determine the predicted refractive outcomes using the Hill‐radial basis function, Barrett Universal II and readily available third or fourth generation intraocular lens power calculation formulas. Main Outcome Measure Mean absolute predicted error. Results The mean absolute predicted difference ranged from 0.30 to 0.34 D. There was no overall significant difference in the predicted difference or variance between formulas. All formulas achieved greater than 78.3% of eyes within ±0.5 D of intended refraction. The Hill‐radial basis function and Barrett formulas provided the lowest mean numerical error compared with existing formulas in short and long eyes, respectively. The Barrett Universal II formula had the lowest percentage of refractive surprises (>1 D from predicted error) across all axial lengths. Conclusions and Relevance Acceptable outcomes can be achieved with optical biometry, consistent surgical technique and use of current intraocular lens power calculation formulas. The Barrett Universal II formula may provide the lowest risk of refractive surprise compared with other intraocular lens power calculation formulas.