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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

Purpose:

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

Setting:

Kanazawa Medical University Hospital, Ishikawa, Japan

Methods:

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.

Results:

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.

Conclusions:

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

Financial Disclosure:

NONE

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