Fellow Eye Calculation

When we see a refractive prediction error of the first eye, we may ask the question of how to use that information to improve the prediction for the second eye. Having ruled out any misreadings, recording errors, IOL constant, IOL power label error, or other obvious mistakes, we still see that the prediction error in the first eye correlates with that of the second eye. Based on correlation analysis, it is possible to empirically adjust for the error and improve the second eye prediction, irrespective of the formula used. The refraction error can be translated to the IOL power of the second eye. Another option is to use the IOL position of the first eye in a ray-tracing thick lens model of the second eye.