Astigmatic neutrality in 1.9-mm coaxial microincision phacoemulsification.

[Extract] Coaxial micro incision cataract surgery (MICS) can now be performed through similar incision sizes to those previously achieved using sleeveless biaxial MICS, ie,<2 mm. However, measurement variation of corneal astigmatism either by keratometers or topographers may mask the astigmatic effect of such small incisions, necessitating the use of a control sample when studying their effect. Knowing that biaxial MICS is astigmatically neutral, we set out to assess the astigmatic effect of coaxial MICS in a sufficiently powered study, controlling for observer variation of keratometry readings