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Calculating the optimal rotation of a misaligned toric intraocular lens
Santos S Tseng1, Joseph J K Ma
1Department of Vision Science, Chung Shan Medical University, Taichung, Taiwan.
Purpose:
To present a formula for calculating the theoretical optimal position of a toric intraocular lens (IOL) that is rotationally misaligned.
Setting:
Private practice in an academically affiliated setting.
Methods:
Using equations for astigmatic decomposition, a formula to calculate the optimal rotation of an implanted toric IOL requiring only the power and axis of the IOL and the total eye astigmatism was derived.
Results:
The optimal rotational position can be obtained from the derivation.
Conclusion:
The formula calculates the rotation an implanted toric IOL must undergo to minimize an eye's manifest astigmatism.
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