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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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Tseng et al. (2008) studied this question.
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