The primary objective of this clinical study is to collect clinical data to support FDA 510(k) submissions for the Topcon CT-800, CT-1, CT-1P and TRK-2P non-contact tonometers. The secondary objective is to evaluate any adverse events found during the clinical study.

Inclusion Criteria:

• At least 18 years of age of either sex and any race or ethnicity;
• Willing and able to provide written informed consent prior to any study procedures being performed;
• Willing and able to follow all instructions and attend all study visits;
• Best Spectacle Corrected Visual Acuity (BSCVA) of 0.3 logMAR (20/40 Snellen equivalent) or better in both eyes as measured using an ETDRS chart.

Exclusion Criteria:

• Only one functional eye;
• Poor or eccentric fixation;
• Corneal scarring or have had corneal surgery, including corneal laser surgery;
• Microphthalmos;
• Buphthalmos;
• Contact lens wearer, meaning having worn soft contact lenses within the past 3 months and/or rigid permeable gas lenses within the past 6 months;
• Dry eyes, meaning having been diagnoses by a physician with dry eyes and currently using a prescribed medication;
• Lid squeezer - blepharospasm;
• Nystagmus;
• Keratoconus;
• Any other corneal or conjunctival pathology or infection;
• Condition or a situation, which in the Investigator's opinion, may put the subject at increased risk, confound study data, or interfere significantly with the subject's study participation.

Ophthalmology practice