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Comparison of OKULIX ray-tracing software with SRK-T and Hoffer-Q Formula in intraocular lens power calculation

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Session Details

Session Title: Pseudophakic IOL Power Calculation: Photic Phenomena after IOL Implantation

Session Date/Time: Sunday 08/10/2017 | 16:30-18:00

Paper Time: 17:12

Venue: Room 3.4

First Author: : M.Ghoreishi IRAN

Co Author(s): :    A. Khalilian   M. Peyman   M. Mohammadinia   A. Peyman           

Abstract Details


to compare the performance of OKULIX ray-tracing software with SRK-T and Hoffer Q formula in intraocular lens power calculation in eyes undergoing cataract surgery.


Research and Development Department, Persian Eye Clinic, Isfahan, Iran


In this prospective study, 104 eyes of 104 patients with cataract who underwent phacoemulsification and IOL implantation were recruited. Three IOL brands were used. For all eyes axial length and keratometry data was obtained with IOLMaster 500 device and IOL power was determined using Hoffer Q and SRK-T formula. The IOL powers were also calculated using the OKULIX ray tracing software combined with CASIA AS-OCT. The accuracy of each calculation methods was measured by subtracting the predicted postoperative refraction from the postoperative manifest refraction spherical equivalent. For each of 3 methods the mean absolute prediction error was determined too.


The mean value absolute prediction error by OKULIX, SRK-T and Hoffer Q formulas, respectively were 0.42 (+/- 0.03), 0.36 ( +/-0.02 ) and 0.37 (+/-0.02). The mean absolute prediction error by OKULIX had no significant difference in all IOLs and formulas. Also in each group of implanted IOLs, all three formulas worked with the same accuracy. The prediction error using OKULIX were within+/-0.50 diopter in 63.5% of eyes and within +/-1.00 diopter in 94.2% of eyes.


OKULIX ray-tracing IOL power measurements in normal cataract eyes provides reliable and satisfactory postoperative results, which are comparable to other 3rd generation formulas of SRK-T and Hoffer Q.

Financial Disclosure:


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