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Poster Details

First Author: S.Perera UK

Co Author(s):    H. Ali              

Abstract Details


It is assumed that a small corneal incision causes flattening in the axis of the incision and corresponding steepening at 90 degrees, keeping the average corneal power the same. This study is an attempt to assess the validity of these assumptions.


Surrey and Sussex NHS Trust Three Arch Road Redhill RH1 5RH, Surrey, UK


30 patients who had cataract surgery by the same surgeon using the same technique with a clear corneal section enlarged to 3.00mm for lens insertion was included in the study. The keratometric readings in the operated eye was repeated at least 1 year later. Automated keratometry readings taken from the IOL master at the pre operative assessment and the post-operative assessment were analysed.


The mean time between pre operative measurements and post operative measurements were 49 months. (Range 12- 72months). Mean change in spherical equivalent pre operatively to post operatively was 0.24 Diopters (D)±0.174 (SD). In 16% of cases the change in spherical equivalent from pre operatively to post operatively was more than 0.50 D


This study shows that the net spherical equivalent change following small incision cataract surgery is not zero as assumed in IOL power calculations. In 16% of cases the difference was more than 0.50D which will affect the refractive outcome by about the same amount.

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