The Heidelberg Engineering ANTERION Corneal Epithelium Thickness Precision and Agreement Study

Inclusion criteria

• Subjects ≥ 22 years of age
• Able and willing to undergo the test procedures, sign informed consent, and follow instructions
• Able to fixate
• With at least one of the following eye status for the corresponding eye population:

• Normal Cornea
• Abnormal Cornea: eye with at least one of the following

a) Keratoconus b) Contact Lens Wearer c) Status Post-Keratorefractive Surgery (at least 30 days between imaging and Keratorefractive Surgery) d) Dry Eye Disease

Exclusion criteria

• Exclusion Criteria General

• Active infection in either eye
• Insufficient corneal reflex, in the study eye
• Physical inability to be properly positioned at the study devices or eye exam equipment
• Exclusion Criteria Normal Cornea Group

• Abnormal cornea shape or corneal surgery in the study eye

• Contact lens wear within 3 months prior to imaging in the study eye

• Dry eye disease in the study eye
• Exclusion Criteria Abnormal Cornea Group

• For Keratoconus (a):
• Contact lenses worn within one hour prior to imaging

• For Contact Lens Wearer (b):
• Keratoconus
• Post-Keratorefractive surgery
• Contact lenses worn within one hour prior to imaging

• For Post-Keratorefractive Surgery (c):
• Keratoconus
• Contact lens wear within 3 months prior to imaging in the study eye

• For Dry Eye Disease (d):
• Keratoconus
• Post-Keratorefractive surgery
• Contact lens wear within 3 months prior to imaging in the study eye