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Appraisal of individual A constants in SRK/T formula Naohisa Nezu 1 1Todoroki Eye Clinic pp.911-914
Published Date 1997/5/15
DOI https://doi.org/10.11477/mf.1410908770
  • Abstract
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From a review of 388 cases of cataract surgery with intraocular lens (IOL) implantation, I evaluated the individual A constants used in SRK/T formula. The individual A constant was actually a variable, because the anterior and posterior lens curvatures as well as the lens thickness changed according to different IOL powers and because the IOL was designed differently for each power. The individual A constant also varied with the axial length to a greater degree than the IOL design. The SRK/T formula therefore did not cover the whole ranges of axial lengths. Further, the SRK/T formula was intended for convex-plano IOL and not for biconvex one. Because of these reasons, the actual postoperative refraction was within ±0.5D from the predicted value in about 50% of cases in the present series.


Copyright © 1997, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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