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Intraocular lens power calculation in the second eye in bilateral cataract surgery: whether use of fellow eye data improves precision of final refractive results?

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Session Details

Session Title: Cataract Surgery Practice Styles

Session Date/Time: Wednesday 17/09/2014 | 08:00-09:30

Paper Time: 09:08

Venue: Boulevard B

First Author: : H.Hashemian IRAN

Co Author(s): :    M. Jabbarvand   M. Khodaparast   E. Mousavi        

Abstract Details


To compare postoperative refractive error in the second eye cataract surgery in 3 groups based on different intraocular lens (IOL) power modifications according to the residual refractive error of the first eye when the error exceeded 0.50 diopter (D).


Ophthalmology research center, Farabi eye Hospital, Tehran University of Medical Sciences


1520 consecutive patients who underwent the first-eye cataract operation 1 to 3 months earlier and were scheduled for cataract surgery in the second eye were entered this Randomized Controlled Trial. If the absolute postoperative SE of the first eye was less than 0.5 D, the patient was excluded. Other patients were assigned to 3 groups and we made different modifications to the calculated IOL power of the second eye according to the residual refractive error of the first eye: In the first group, no change was made to the calculated power (unadjusted group). In the second group, the IOL power was we adjusted for 50% of the residual refractive error of the first eye (50% adjusted) and in the third group, 100% adjustment was made (100% adjusted). The second-eye refractive error was evaluated 8 weeks after surgery and was compared in three groups.


A total of 409 patients met inclusion criteria. 136 patients were assigned to 100% adjusted group; 137 patients were assigned to 50% corrected group and in 136 patients no adjustment was made to the IOL power of the second eye. The average of the absolute values of the residual postoperative refractive error of the second eye were 0.26 ± 0.2 diopters (D) in 100% adjusted group; 0.33 ± 0.25 diopters (D) in 50% adjusted group; 0.57 ± 0.27 diopters (D) in nonadjusted group.(P<0.05) The percentages of patients achieving postoperative refractions within 0.5 D and 1.0 D of the predicted refraction were 95% and 100%, respectively, in the 100% adjusted group, 87% and 99 %, respectively, for the 50% adjusted group, and 58% and 97%, respectively, for the unadjusted group.


In bilateral cataract surgery; accounting for 50% of the residual refractive error of the first eye in IOL calculation of the second eye can improve refractive results of the second eye.

Financial Interest:


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