Reliability and Reproducibility of the Eye Check Tonometer

Inclusion Criteria: * Age of 18 years or older, * Any glaucoma patient or glaucoma suspect patient * Presents for an appointment wearing their own soft contact lens. Exclusion Criteria: * Arthritis affecting the upper extremity in the patient or caregiver * Patient unwilling or assessed to be unable to comply with the study protocol * Any corneal abnormalities such as opacities, scars, Fuchs dystrophy, map dot fingerprint dystrophy, history of recurrent corneal abrasion, corneal surgery such as Lasik, PRK, DSAEK, transplant or implant * History of any ongoing ocular symptoms such as eye pain or redness or discharge * History of recent ocular surgery (done in the past 3 months) * History of a any filtering or tube surgery for glaucoma (to reduce risk of infection associated complications) * Recent eye infection (within the past 3 months) * History of diabetes for \> 5 years duration * Monocular patient * Best corrected visual acuity\< 20/70 * Head or hand tremors