Inclusion Criteria:  At least 18 years of age . Stable eyeglass and contact lenses prescription for at least 2 to 3 years . Stable vision over at least the past year . No history or findings of active corneal disease . No significant dry eye . Not pregnancy or nursing . Refractive cylinder more than -1D (Diopter) .  Exclusion Criteria:  Certain conditions make the method inadvisable :  Residual , recurrent or active ocular disease such as uveitis , sever dry eyes , sever allergic eye disease , glaucoma visually significant cataract , and retinal disease . Previous corneal surgery or trauma within the corneal flap zone . Patent corneal vascularisation within 1mm of the corneal flap zone . Age less than 18 years old . Pregnancy or breast feeding . Certain medical conditions such as autoimmune diseases (eg. lupus , rheumatoid arthritis), immunodeficiency states (eg. HIV) and diabetes may prevent proper healing after a refractive procedure. Systemic medications likely to affect wound healing such as retinoic acid and steroids . Keratoconus or other active eye disease .