This comparative clinical study has indicated the importance of correctly choosing a formula to calculate the focal power of an intraocular lens (IOL) in the short ocular anteroposterior axis (APA). The most accurate and comparable formulas SRK II and SRK/T at the mean ocular APA values have significant errors at an APA of less than 21 mm. The new empirical formula allows the accuracy of calculation of the focal power of IOL to be increased in the short ocular APA as compared with other currently used formulas.
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