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OATZ (Optimised Aspheric Treatment Zone - Aspheric) means ‘not spherical/round’. Optimised Wavefront is for those with normal corneal surfaces but whose general shape of the eye is not optically round enough for perfect focusing.

CATZ means Customised Aspheric Treatment Zone. Customised Wavefront is used for patients whose eyes have undulations on the corneal surface that require individual removal and who will benefit from Aspheric Treatment.