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Posterior corneal astigmatism can be incorporated into toric IOL selection
Since before the turn of the 20th century, we recognized that there was a mismatch between anterior corneal astigmatism and refraction, although we were unable to pinpoint the cause. However, a new look with the aid of modern technology has shown us that posterior corneal astigmatism, or PCA, is also a significant player in the overall picture.In 2009, Ho and colleagues published a study of 493 subjects comparing the keratometric corneal astigmatism with the total corneal astigmatism derived by double-angled vector analysis of both corneal surfaces with the Pentacam (Oculus). (Read more...)