The purpose of this study is to determine if the device, CATS tonometer prism, measures intraocular pressure significantly differently than the current standard of care tonometer prism (Goldmann) before and after a corneal crosslinking procedure. This difference would be a measurement of the amount of corneal biomechanical changes made due to the cross-linking procedure.

This clinical trial is a prospective, controlled, study and will be performed at one clinical investigative sites in Tucson Arizona1. The purpose of this study is to determine if the device, CATS tonometer prism, measures intraocular pressure significantly differently than the current standard of care tonometer prism (Goldmann) before and after a corneal crosslinking procedure. This difference would be a measurement of the amount of corneal biomechanical changes made due to the cross-linking procedure.

Inclusion Criteria:

• Male and female patients, at least 18 years of age
• Subject has a clear understanding and agrees to all the conditions of the informed consent form

Exclusion Criteria:

• • Subject has undergone ocular surgery within the last 3 months

  • Uncontrolled systemic disease that in the opinion of the Investigator would put the subject's heath at risk
  • Pregnant or nursing women
  • Those who have had corneal surgery including corneal laser surgery
  • Microphthalmos
  • Buphthalmos
  • Severe Dry eyes
  • Lid squeezers - blepharospasm
  • Nystagmus
  • corneal or conjunctival infection.

Twenty three (23) Subjects 18 years and older and will be enrolled from one clinical. Subjects will be chosen from patients who are being examined for a corneal cross-linking procedure.