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Abstract

Objectives: To assess the accuracy of posterior chamber intraocular lens power calculation. Study design: Prospective analytical study. Place and duration of study: Department of Ophthalmology, Jinnah Hospital and Mayo Hospital Lahore. October 2002 to December 2002 and October 2006 to January 2007. Subject and methods: A study of 100 cataractous eyes of patients attending the outpatients department and admitted in the ward. As the intraocular lens implanted is planned for emmetropia by using SRK II regression formula, mean deviation of the post-operative pseudophakic refractive error were noted. In case of cylindrical error, half of the error was taken as spherical equivalent. Range of error, mean error, and standard deviation were calculated Results: The corrected postoperative visual acuity was 6/6 in 47 patients (47%), 6/9 in 39 patients (39 %), 6/12 in 13 patients (13 %) and 6/18 in 1 (1%) patient. Postoperative spherical equivalent was found to be 0 in 42 patients (42 %), ± 1D in 29 (29 %) patients, ± 2D in 20 (20 %) patients, ± 3D in 9 (9 %) patients. Conclusion: The calculation of IOL power from biometric data offers valuable control over the postoperative refraction with the virtual elimination of significant unwanted postoperative refractive errors.