To study the postoperative results in myopic and hyperopic eyes treated with two different laser ablation algorithms (STD and F-CAT), both FDA approved.

Inclusion Criteria:

• Myopic and hyperopic eyes eligible for LASIK or PRK refractive correction
• Central corneal thickness more than 500 micrometers

Exclusion Criteria:

• Topographies of less than 55% of successful total sampled area and eyes exhibiting asphericity variations, in either the horizontal or the vertical axis, greater than 0.2
• Corneal scarring
• Cataract surgery
• Corneal ulceration
• Topographical abnormalities

Forty eight myopic (24 patients) and 24 hyperopic eyes (12 patients)