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Comparison of accuracy of four commonly used IOL calculation formulae with and without personalized lens constants in pediatric eyes

Session Details

Session Title: Paediatric Cataract Surgery

Session Date/Time: Monday 07/10/2013 | 16:30-18:00

Paper Time: 17:42

Venue: Forum (Ground Floor)

First Author: : V.Vasavada INDIA

Co Author(s): :    A. Vasavada   S. Shah   V. Vasavada   S. Srivastava   R. Trivedi   Raj

Abstract Details


To evaluate and compare the prediction error in pediatric eyes using the Holladay 1, Hoffer Q, Holladay II and SRK/T formulae.


Iladevi Cataract & IOL Research Centre, Raghudeep Eye Clinic


Prospective,interventional case series in 117 eyes undergoing pediatric cataract surgery with intraocular lens(IOL) implantation.Prediction error was calculated using the predicted postoperative refraction minus actual postoperative refraction.This was done for each formula using manufacturerÂ’s lens constant,as well as the personalized lens constant.Further, prediction error was evaluated according to axial length.


Median age at surgery was 1.72 years and median follow-up,27 days.Using Holladay 2,Holladay 1,Hoffer Q,and SRK/T formulae with manufacturerÂ’s lens constant, mean absolute prediction error was 1.2 diopter(D)+1.18 (SD),1.29D+1.25,1.43D +1.37,and 1.19D +1.15 respectively.Mean absolute prediction error was 1.2D +1.15,1.26D +1.18,1.37D +1.29,1.19D +1.1 respectively when using personalized lens constant. SRK/T and the Holladay 2 formula had the least absolute prediction error


In pediatric eyes, the SRK/T and the Holladay 2 formula had the least absolute prediction error even in the absence of preoperative refraction. Because of multiple variables causing inaccurate prediction, personalization of lens constant did not significantly improve absolute prediction error

Financial Interest:


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