The ASCRS Online Post-Refractive Intraocular Lens Power Calculator
A particularly useful resource for calculating IOL power in a post–refractive surgery patient has been developed by Warren Hill, MD; Li Wang, MD, PhD; and Douglas D. Koch, MD. It is available on the website of the American Society of Cataract and Refractive Surgery (ASCRS) (www.ascrs.org) and directly at http://iolcalc.ascrs.org.
To use this IOL calculator, the surgeon selects the appropriate prior refractive surgical procedure and enters the patient data, if known (Fig 11-1). The IOL powers, calculated by a variety of formulas, are displayed at the bottom of the form, and the surgeon can compare the results to select the best IOL power for the individual situation. This spreadsheet is updated with new formulas and information as they become available and, at this time, probably represents the best option for calculation of IOL powers in post–refractive surgery patients. For more detailed IOL power calculation information, see BCSC Section 3, Clinical Optics.
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Awwad ST, Manasseh C, Bowman RW, et al. Intraocular lens power calculation after myopic laser in situ keratomileusis: estimating the corneal refractive power. J Cataract Refract Surg. 2008;34(7):1070–1076.
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Chen M. An evaluation of the accuracy of the ORange (Gen II) by comparing it to the IOLMaster in the prediction of postoperative refraction. Clin Ophthalmol. 2012;6:397–401.
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Chokshi AR, Latkany RA, Speaker MG, Yu G. Intraocular lens calculations after hyperopic refractive surgery. Ophthalmology. 2007;114(11):2044–2049.
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Fram NR, Masket S, Wang L. Comparison of intraoperative aberrometry, OCT-based IOL formula, Haigis-L, and Masket formulae for IOL power calculations after laser vision correction. Ophthalmology. 2015;122(6):1096–101.
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Hill WE, Byrne SF. Complex axial length measurements and unusual IOL power calculations. Focal Points: Clinical Modules for Ophthalmologists. San Francisco: American Academy of Ophthalmology; 2004, module 9.
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Masket S, Masket SE. Simple regression formula for intraocular lens power adjustment in eyes requiring cataract surgery after excimer laser photoablation. J Cataract Refract Surg. 2006; 32(3):430–434.
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Shammas HJ. Intraocular lens power calculation in patients with prior refractive surgery. Focal Points: Clinical Modules for Ophthalmologists. San Francisco: American Academy of Ophthalmology; 2013, module 6.
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Wang L, Hill WE, Koch DD. Evaluation of intraocular lens power prediction methods using the American Society of Cataract and Refractive Surgeons Post-Keratorefractive Intraocular Lens Power Calculator. J Cataract Refract Surg. 2010;36(9):1466–1473.
Excerpted from BCSC 2020-2021 series: Section 13 - Refractive Surgery. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.