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The Asphericity Asymmetry Index (AAI) Quantifies the Asymmetry of Asphericity over the Corneal Surface. As Shown by Smadja et al. [5, 11], it is Best Assessed using the Best-fit Toric Aspheric (BFTA) Maps of the Galilei System. AAI is Calculated as the difference between the Maximum Negative and Positive BFTA elevation Values
