A Prospective Safety and Effectiveness Study of the 500 Hz Technolas Perfect Vision Excimer Laser in Asian Eyes Using LASIK

General Inclusion Criteria * Subjects have to be at least 18 years of age. * Subjects have to be able to read, understand, and sign a statement of Informed Consent. * Subjects have to be willing and able to return for scheduled follow-up examinations for up to 6 and 12 months respectively after surgery. * Corneal topography should be qualified * High contrast, manifest, best spectacle-corrected distance visual acuity correctable binocular to at least 1.0 (Snellen 20/20 or 6/6) and monocular to at least 0.8 (Snellen 20/25 or 6/7.5). In case of a monocular surgery the eye which should not be treated must have a best corrected distance visual acuity of at least 0.8 (Snellen 20/25 or 6/7.5). * Mesopic pupil size measured with the Zywave II WaveFront Aberrometer must be \< 7.0 mm and photopic pupil size measured with the Orbscan II/ IIz must be \> 2.9 mm. Additional Inclusion Criteria for Proscan Treatments * For Proscan myopic subjects require a sphere between -0.5 D up to -10.0 D and cylinder between -0.5 D up to -4.0 D (not corneal astigmatism) and SE up to -12.0 D * For Proscan hyperopic subjects require a sphere between +0.5 D up to +4.0 D and cylinder between +0.5 D up to +4.0 D (not corneal astigmatism) and SE up to +6.0 D. Additional Inclusion Criteria for Zyoptix Treatments For Zyoptix myopic subjects require a sphere between -0.5 D up to -10.0 D and cylinder between -0.5 D up to -4.0 D (not corneal astigmatism) and SE up to -12.0 D * For Zyoptix hyperopic subjects …