CONTACT-LENS BASE CURVE PREDICTION FROM VIDEOKERATOGRAPHY

Purpose. To assess whether the contact lens to cornea-bearing relation ship, as determined from the fluorescein pattern, can be predicted fro m videokeratography, Methods. Nineteen non-rigid gas permeable (RGP) l ens wearers were each tested for fluorescein patterns with a series of seven RGP contact lenses of different base curves, and compared to a theoretical estimate of the fitting relationship from videokeratograph y. The experimentally determined alignment lens was then compared to t he theoretical alignment (TA) value as determined from the central cur vature and eccentricity. Results. The mean difference in lens choice b etween the TA and experimental alignment (EA) values was -0.01 +/- 0.0 4 mm and between the simulated keratometric (KA) readings and the EA c hoice was 0.11 +/- 0.05 mm, Conclusion. A knowledge of the eccentricit y value from videokeratography allowed a better prediction of the base curve to cornea relationship than was provided by only a central corn eal measurement.