Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance
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10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits

 

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Accuracy and prediction error of various formulae for intraocular lens power calculation

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Session Details

Session Title: Presented Poster Session: Monofocal IOL

Session Date/Time: Sunday 11/09/2016 | 09:30-11:00

Paper Time: 10:20

Venue: Poster Village: Pod 4

First Author: : S.Kochar INDIA

Co Author(s): :    S. Das   M. Kurian   A. Zope        

Abstract Details

Purpose:

To assess the accuracy and prediction error of five formulae for intraocular lens (IOL) power calculation - SRK-T, BARRETT 1, BARRETT 2, OLSEN and HOLLADAY in adult eyes.

Setting:

Tertiary eye care centre in Bangalore, India

Methods:

216 eyes of 197 patients with age related cataract who underwent uncomplicated cataract surgery and IOL implantation by a single surgeon over a period of 6 months were evaluated retrospectively. To predict refractive outcome, axial length (AL), keratometry (K), and manufacturer’s A constant were employed in five IOL power calculation formulae. Residual refraction was measured at 6 weeks post-operatively and converted to spherical equivalent. We calculated the prediction error (PE) (Prediction Error =Predicted refraction – Actual refraction) in each case and the one that gave the best prediction (minimum PE) was determined.

Results:

Mean absolute PE was -0.13 for the SRK-T, -0.18 for BARRETT 1, -0.10 BARRETT 2, -0.1 for OLSEN and -0.19 for HOLLADAY. On comparing PE obtained with 5 formulae in each patient, BARRETT 2 gave the minimum mean PE. For all the five formulae, Mean Absolute PE and Mean PE were insignificant (< 0.25 D).

Conclusions:

The Prediction Error was insignificant (PE <0.25 D) in all eyes, and similar for all formulae. However, the BARRETT 2 gave the most predictable results for the highest number of eyes.

Financial Disclosure:

NONE

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