September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Comparative Analysis of Accuracy and Predictability of Intraocular Lens Power Calculation after Refractive Surgery: Conventional Regression Formula versus ASCRS Calculator
Author Affiliations & Notes
  • Byeong Soo Kang
    Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea (the Republic of)
  • Joo Youn Oh
    Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea (the Republic of)
    Laboratory of Ocular Regenerative Medicine and Immunology, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea (the Republic of)
  • Mee Kum Kim
    Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea (the Republic of)
    Laboratory of Ocular Regenerative Medicine and Immunology, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea (the Republic of)
  • Won Ryang Wee
    Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea (the Republic of)
    Laboratory of Ocular Regenerative Medicine and Immunology, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea (the Republic of)
  • Footnotes
    Commercial Relationships   Byeong Soo Kang, None; Joo Youn Oh, None; Mee Kum Kim, None; Won Ryang Wee, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 3102. doi:
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      Byeong Soo Kang, Joo Youn Oh, Mee Kum Kim, Won Ryang Wee; Comparative Analysis of Accuracy and Predictability of Intraocular Lens Power Calculation after Refractive Surgery: Conventional Regression Formula versus ASCRS Calculator. Invest. Ophthalmol. Vis. Sci. 2016;57(12):3102.

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      © 2017 Association for Research in Vision and Ophthalmology.

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Abstract

Purpose : To compare the accuracies of calculation of intraocular lens (IOL) power using conventional regression formula or American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator with previous corneal refractive surgery.

Methods : We retrospectively reviewed 96 eyes of 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula using into two means; (1) IOL powers using the ASCRS IOL power calculator, (2) IOL powers using the conventional formula with previous refractive data (Camelin, Jarade, Savini and clinical history method) or without prior data (0, 2 and 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz and Maloney). Two conventional IOL formulas (SRK/T and Hoffer Q) calculated with single K method and double K method. Mean arithmetic refractive error (MARE) and mean absolute error (MAE) was calculated at the first postoperative month.

Results : In conventional formula, Jarade method or Seitz method, applied in Hoffer Q formula with Single K or Double K method, have the lowest prediction errors. Least prediction error was shown in Shammas-PL method among the ASCRS group. There is no statistically significant difference between the 10 lowest MAE conventional methods and Shammas-PL method using ASCRS calculator.

Conclusions : Shammas-PL formula, calculated by ASCRS calculator, is considered a comparable method to the 10 most accurate conventional formulae. Other methods using ASCRS show a myopic tendency.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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