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Comparison of IOL power calculation using automated keratometry, optical biometry and ray tracing in patients with previous RK with Flat K less than 30D

Poster Details

First Author: A.Mathur INDIA

Co Author(s):    J. Ashar                    

Abstract Details


To compare IOL power in patients who had RK in past using Automated Keratometry based K values, Optical Biometer (Nidek, AL- Scan) & Ray tracing (Sirius, CSO)


Mumbai Eye Care


8 eyes / 4 cases with RK undergoing cataract surgery had Automated keratometer, Ultrasound A SCAN, Optical biometer & Ray tracing. The IOL power was measured using all & average value on the SRK/T formula was selected (Alcon IQ). Post operative refraction was performed at 1 week and was compared with the emmetropic power with each of the machines


At 1 week the mean BCVA was 0.9. The average refractive sphere was �.0D ( Range -0.5 to �). Post operative emmetropic power selected using mean power from all the machine showed a hyperopic surprise. If IOL power was to be chosen using Ray tracing, we would be closest to emmetropia


In patients who have undergone RK in past, Ray tracing is good to calculated IOL power. Hyperopic surprises are common. Target myopia to avoid surprises

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