Corneal SIA Tool

This Excel spreadsheet has been developed based on the following published correspondence:

Koch DD, Wang L. Surgically Induced Astigmatism.Journal of Refractive Surgery2015; 31 (8): 565.

It will automatically generate Double-angle plots of the corneal surgically induced astigmatism for OD and OS including centroid values and standard deviations, and 95% confidence ellipses of the dataset and of the centroid values.