Automated Applanation Tonometry - Updated

Conditions studied

Glaucoma, Glaucoma, Suspect

About this study

Goldmann Applanation Tonometry (GAT) is considered the clinical gold standard for eye pressure measurements and yet it is known to be a subjective measurement with limited repeatability and limited portability. Another clinical standard for checking eye pressure is known as the pneumotonometer. This method is more objective but not portable. The purpose of this study is to develop new methods of measuring eye pressure that are more objective, reproducible and portable. In this study, the investigators will be comparing the eye pressure measurements using 2 investigational methods to GAT and pneuumotonometer.

Interventions

• Device: Standard GAT — Standard Goldmann Applanation Tonometry (GAT): this is the standard method for IOP measurement in clinical practice
• Device: Fixed force GAT — An investigational device similar to standard GAT
• Device: Upright applanating prototype — An investigational device, prism used in standard and fixed-force GAT is attached to a portable device
• Device: Pneumotonometer — This is a standard for checking eye pressure. A topical anesthetic (numbing agent). A probe will touch the front of the eye while the machine measures the eye pressure

Primary outcomes

• Intraocular pressure (IOP) as measured by standard GAT (Baseline)
• Intraocular pressure (IOP) as measured by fixed force GAT (Baseline)
• Intraocular pressure as measured by upright applanating (Baseline)
• Intraocular pressure as measured by supine Pneumotonometer (Baseline)