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Influence on toric intraocular lens axis by incision misalignment: a simulation study

Poster Details

First Author: H.Sasaki JAPAN

Co Author(s):    A. Okamoto   N. Shibata   E. Shibuya   N. Mita   H. Ishida   E. Kubo     

Abstract Details


We simulated the influence on toric intraocular lens (IOL) axis shift by incision malposition, using a toric IOL calculator.


Kanazawa Medical University Hospital, Ishikawa, Japan


Optimum toric IOL axis was determined using an astigmatism planner (VERION, Alcon). Magnitudes of against-the-rule corneal astigmatisms (CA) included 0D, 1D, 2D, and 3D, with expected incision location (EIL) at temporal 180�Â�°. Recommended toric IOL axis was calculated under condition of incision location varying by 1 degree through 360 degrees and surgically induced astigmatism (SIA) varying by 0.1D from 0.1D to 1.0D. IOL misalignment between recommended and expected toric IOL axis was investigated per SIA.


Under recommended toric IOL axis of 0 degree, IOL misalignment increased with incision differing from EIL from 30 to 40 degrees. However, IOL misalignment decreased with incision differing from EIL above 40 degrees, becoming 0�Â�° at difference of around 90 degrees. IOL misalignment by incision difference from EIL was increased with decreased CA and increased SIA. At 2D magnitude CA, incision locations 10 and 20�Â�° different from EIL resulted in IOL misalignment of 3 and 6�Â�° under SIA of 0.5D, and 9 and 14�Â�° under SIA of 1D.


Toric IOL axis differed markedly with increasing difference between recommended and actual incision location, and increased with decreasing CA and increasing SIA.

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