AUTHORS.
Alfonso JF, Lisa C, Fernández-Vega L, Madrid-Costa D, Montés-Micó R.

METHODS.
Two hundred and nineteen keratoconic eyes were divided into three groups as a function of stage of keratoconus (stages I, II and III). There were 115 eyes with stage I, 84 eyes with stage II and 20 eyes with stage III. Snellen uncorrected distance visual acuity (UDVA), best corrected distance visual acuity (CDVA), and residual refractive errors analyzed using vector analysis were recorded before surgery and 6 months post-surgery.

RESULTS.
For stage I, UDVA changed from 0.26?±?0.19 pre-surgery to 0.58?±?0.30 post-surgery (P?2 lines of CDVA, 25% did not change their CDVA, and 15% lost lines of CDVA. A significant decrease in the spherical equivalent after surgery was found for stages I and II (P?