We read with interest the editorial by Dr Warren Hill. We agree there is evidence that optical biometry allows improved precision of refractive outcomes compared with applanation and perhaps immersion ultrasound axial length measurement. We also agree that the benchmark standards suggested by Gale et al . in 2006 should be raised, in our experience to 70% within ±0.5 dioptre (D) and 95% within ±1.0 D when using IOL Master biometry and this level of precision has been observed by other groups using third‐generation biometry formulae. Where we disagree with Dr Hill is in his assertion, without quoting any scientific studies, that third‐generation biometry formulae (Hoffer Q, SRK/T and Holladay 1) are worse predictors of postoperative refraction than fourth‐generation formulae (Haigis, Holladay 2 and Olsen). Although these newer formulae may offer benefits in individual eyes with unusual anatomy of the anterior or posterior segments the published literature fails to demonstrate any additional benefit over third‐generation formulae for the eyes with non‐extreme axial length. Navarez et al . performed a comparative analysis on 643 eyes and found no statistically significant differences in mean absolute error (MAE) between the four formulae in any of the axial length intervals. Hoffer compared
Clinical & Experimental Ophthalmology – Wiley
Published: Jul 1, 2010
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