Keratometry Adjustor Calculator for Posterior Cornea Effect (

Prof Goggin of Australia has a special interest in toric control with cataract surgery.

This part of his Site provides a practical way to incorporate posterior Cornea data to adjust Toricity in WTR vs ATR astigmatism of 0,75 D to 2,50 D. He overcorrects ATR  by x1,41 and undercorrects WTR by x 0.75 eyes.


1. Do not attempt this when utilizing sites already incorporating similar logistics (eg Barrett)

2. Do correct astigmtism at 0,75D level and consider utilizing manufacturers that have a 0,50D increment scale to have an accurate result.

3. Do not be afraid to flip the axis if required to minimize astigmatism: Patients don;t mind.