Posters

Evaluating the difference in keratometry readings between autorefractor and IOLMaster in pre-op cataract patients

Poster Details

First Author: F. Chew UNITED KINGDOM

Co Author(s):    J. Chew                    

Abstract Details

Purpose:

In the advent of increasing popularity of toric lenses during cataract surgery, the accuracy of keratometry readings is paramount. This study, therefore aims to evaluate and establish if there is a significant difference between keratometry readings between the autorefractor and the IOL master.

Setting:

This study was carried out in a primary care, one stop cataract clinic in East Kent Hospitals Foundation Trust.

Methods:

Retrospective analysis of patient records who attended the one stop cataract clinic over the 6 month period was recorded. Patients with ocular surface problems and keratoconus were excluded. The Topcon Autorefractor KR/RM 800 was used and the K readings were compared to the Zeiss IOLMaster 500. The keratometry values, including K1, K2 and the degree of the steepest axis was recorded.

Results:

A Total of 121 patient records were analysed. Of which 40% were male and 60% female. There was a mean difference of 0.29D between the keraometry readings of the autorefractor and the IOL master 500, with a range of values between 0 and 1.12D. There was also a mean difference of 17 degrees between the autorefractor and the IOL master in avaluating the axis of the steepest curvature with a range of values between 0 and 63 degrees.

Conclusions:

This study shows that there is good correlation between the keratometry readings between the autorefractor and the IOL Master 500, however caution needs to be exercised in applying the one size fits all principle, particularly in patients with tear film diseases and those with corneal pathology. Further studies will need to be performed in order to evaluate the accuracy and correlation of various forms of keratometry measuring devices, in particular patients with corneal pathology.

Financial Disclosure:

NONE