(1) Are under 21 years old. At this age, your are still growing and are susceptible to change

(2) Are pregnant or nursing. While pregnant, changes occur in your hormone system that can alter your vision. It's better to postpone the operation until after your child is born and after you are finished nursing

(3) Are taking certain medications

(4) Have high blood pressure

(5) Have very large pupils

(6) Have thin corneas

(7) Have dry eyes

(8) Have Glaucoma Keratoconus (a corneal irregularity)

(9) Suffer from eye inflammation

(10) Suffer from Herpes simplex

(11) Suffered severe eye injuries in the past

(12) Suffered corneal infections or scars

(13) Suffer from unstable refraction or refractive errors

(14) Suffer from other diseases of the eyes such as AMD, anopsia or others