Abstract
We appreciate Dr Cooke's comments and interest in the Infant Aphakia Treatment Study (IATS) population for comparison of intraocular lens (IOL) calculation formula performance. 1 VanderVeen D.K. Trivedi R.H. Nizam A. Lynn M.J. Lambert S.R. Predictability of intraocular lens power calculation formulae in infantile eyes with unilateral congenital cataract: Results from the Infant Aphakia Treatment Study. Am J Ophthalmol. 2013; 156: 1252-1260 Abstract Full Text Full Text PDF PubMed Scopus (43) Google Scholar We also appreciate his assistance in accessing some of the additional formulae. The table shows absolute prediction errors for the IATS eyes using the manufacturer's A-constant. Of the 4 additional formulae examined (bold), T2 had the smallest mean and median absolute prediction error. TableAbsolute Prediction Error by Intraocular Lens Calculation Formula using Manufacturer Constants Formula (n=43) Absolute Predictor Error (Diopters) Mean ± SD a (1st Quartile, 3rd Quartile) Median (a) Haigis (n=33) 3.5 ± 2.2 3.5 (1.4, 5.1) Hoffer Q 2.6 ± 2.0 2.1 (0.7, 4.0) Holladay 1 1.7 ± 1.3 1.2 (0.7, 2.5) Holladay 2 1.9 ± 1.5 1.4 (0.6, 2.9) Olsen (n=33) 2.2 ± 1.7 1.6 (0.9, 3.3) SRK/T 1.4 ± 1.1 1.3 (0.3, 2.1) SRK II 2.4 ± 1.8 2.2 (0.9, 3.6) T2 1.3 ± 1.0 1.1 (0.5, 2.0) Universal 3.0 ± 2.2 2.8 (1.1, 4.7) SD = Standard Deviation; SRK/T = Sanders-Retzlaff-Kraff Theoretic; SRK II = Sanders-Retzlaff-Kraff II. a (1st Quartile, 3rd Quartile) Open table in a new tab SD = Standard Deviation; SRK/T = Sanders-Retzlaff-Kraff Theoretic; SRK II = Sanders-Retzlaff-Kraff II. Predictability of Intraocular Lens Power Calculation Formulae in Infantile Eyes With Unilateral Congenital Cataract: Results From the Infant Aphakia Treatment StudyAmerican Journal of OphthalmologyVol. 157Issue 6PreviewThe recent article describing the results from the infant aphakia treatment study1 contains a rare set of short eyes. It would be helpful to the ophthalmic community to have a starting point from which to choose lens constants for these formulas in short, infantile eyes. Full-Text PDF
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