Toric intraocular lens calculations - Reply

Goggin, Michael, Esterman, Adrian, and Moore, Sacha (2012) Toric intraocular lens calculations - Reply. JAMA Ophthalmology, 130 (7). pp. 948-949.

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[Extract] We thank Dr Simpson for pointing out the typographical error in our article.1 He is correct. The formula should have read E = F /[1 + (d /1.336) F]. All calculations in the article were done using this correct formula, and the formula in the article has been corrected. With regard to the suitability of this formula for the task of predicting toric IOL outcome, we have demonstrated that it predicted the outcome better than the Alcon online calculator. He is right that it is related to the formula for adjusting effective powers between contact lenses and spectacle lenses, but the incorporation of an index of refraction for aqueous and cornea (1.336) makes it suitable for calculation of equivalent powers within the eye. The US patent application document for the online Alcon toric calculator2 uses such formulas in a more detailed manner, calculating vergence at the cornea and the first and second principal planes of the IOL.

Item ID: 50804
Item Type: Article (Editorial)
ISSN: 2168-6173
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Date Deposited: 11 Oct 2017 00:21
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1117 Public Health and Health Services > 111799 Public Health and Health Services not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920499 Public Health (excl. Specific Population Health) not elsewhere classified @ 100%
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