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Managing, Interpreting, and Utilizing Posterior Astigmatism

James Katz, MD, explains the importance of total cornea astigmatism (TCA). Studies show that the relationship between anterior and posterior astigmatism can vary largely between patients, therefor patients would benefit from individual measurements rather than having a population average. The Cassini Total Cornea Astigmatism software provides total axis and total magnitude during the topography exam.