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Do fluctuations in corneal curvature measurements affect predictability of IOL power calculations?

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Session Details

Session Title: Cataract Surgery Outcomes. IOL Power Calculations

Session Date/Time: Monday 07/09/2015 | 16:30-18:30

Paper Time: 17:40

Venue: Room 1

First Author: : S.Perera UK

Co Author(s): :    G. Verroiopoulos                    

Abstract Details


To ascertain if the keratometric readings (K1 &K2) and the mean keratometric power of the cornea (MK) show a significant difference between two IOL master readings taken at least one year apart, and the effect of the difference if any, on IOL power calculation.


rince Charles Eye Unit, King Edward the V11 Hospital, Windsor, UK


111 consecutive patients who had IOL master biometry in the un-operated eye twice, at least 1year apart were included in the study. The readings for K1, K2 and mean K from the 1st measurement was compared with the second measurement and the difference analyzed.


The difference between the mean for the two readings for K1 and K2 were 0.05 ±0.38D and 0.04±0.34D respectively. The difference in the MK between the two readings was 0.04±30D. The changes in the means were not statistically significant. However in 20% of cases the difference in the readings would have made a 0.25D change in the refractive outcome whilst is 5% of cases the difference was more than 0.50D.


This study shows that there is temporal fluctuation in corneal curvature, and performing biometry nearer the time of surgery may give a more accurate outcome.

Financial Interest:


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