Inclusion Criteria:

Normals

• Patients seeking initial laser vision correction that were screened to be good candidates for the procedure.
• No history of refractive or other ocular surgery.
• No corneal pathologies.
• Normal corneal topography.
• Contact lens wearers should discontinue use at least 2 weeks for hard contacts, and 3 days for soft lenses prior to imaging.

Keratoconus

• An irregular cornea determined by distorted keratometry mires, distortion of the retinoscopic, or ophthalmoscopic red reflex (or a combination of these)
• At least one of the following biomicroscopic signs: Vogt's striae, Fleischer's ring of >2 mm arc, or corneal scarring consistent with keratoconus.
• Contact lens wearers should discontinue use preferably 1 day or at least half an hour prior to imaging.

Myopic Laser Vision Correction

Patients who have undergone myopic:

• LASIK
• PRK
• LASEK

Hyperopic Laser Vision Correction

Patients who have undergone hyperopic:

• LASIK
• PRK
• LASEK

Orthokeratology

• Patients using specially designed rigid contact lenses to reshape the cornea to temporarily reduce or eliminate refractive error.
• Subjects must be 18 years of age or older; able and willing to make the required visit; and able and willing to give consent.

Exclusion Criteria:

• Patients that underwent corneal transplantation or any ocular surgery for the following categories: normal, keratoconus, and orthokeratology)
• Any active infection or inflammation of the cornea.
• PI decides that subject is not suitable due to medical risk.