Hoffer Q formula in the IOLMaster

References 

1. Marchiondi S, Goldblum D. Comparison of the published Hoffer Q formula and the Hoffer Q formula used by the IOLMaster 4.02/5.02. J Cataract Refract Surg. 2008;34:2002
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2. Hoffer KJ. The Hoffer Q formula: a comparison of theoretic and regression formulas. J Cataract Refract Surg. 1993;19:700–712errata 1994; 20:677
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3. Zuberbuhler B, Morrell AJ. Errata in printed Hoffer Q formula. [letter] J Cataract Refract Surg. 2007;33:2;reply by KJ Hoffer, 2–3
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4. Holladay JT. Standardizing constants for ultrasonic biometry, keratometry, and intraocular lens power calculations. J Cataract Refract Surg. 1997;23:1356–1370Available at: http://www.docholladay.com/publications/StandardizingConstants.pdfAccessed March 28, 2009