Evaluation of RTVue in Corneal Measurement

Inclusion Criteria: Normal cornea: * 18 years of age or older * No corneal pathology * No prior ocular surgery and no prior laser refractive surgery Post laser refractive surgery: * 18 years of age or older * No corneal pathology * No prior ocular surgery except laser refractive surgery * At least 1 week post laser refractive surgery without complication Corneal pathology: * 18 years of age or older * Clinical diagnosis of one or more type of corneal pathologies, including corneal scar and keratoconus, etc., excluding eyes in which corneal power measurement are not clinically relevant (e.g., eyes requiring corneal transplant) * No prior laser refractive surgery Cataract surgery: * 18 years of age or older * No corneal pathology * No prior ocular surgery, no prior laser refractive surgery, and no prior cataract surgery * Post surgery visit shall only include eyes without complication