PRK more accurate when astigmatism isn't also a factor

Ophthalmology Times | March 1, 1999| | Copyright

MELBOURNE, AUSTRALIA-A new method of astigmatism analysis that uses both corneal and refractive data has shown that PRK to treat myopic astigmatism with the VISX 20/20 excimer laser is not as successful as PRK to treat spherical myopia.

Using the method designed by Noel Alpins, FRACO, FRCOphth, FACS, authors of a study reported one of the early causes for this shortfall in treatment was that the programmed astigmatism treatment in the laser undercorrected astigmatism by 20%.

"This trend, when first detected in February 1993, initiated the adjustment in the VISX algorithm to 1.20 of ...

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