Automated Applanation Tonometry - Updated
Duke University
Summary
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.
Description
This is a prospective study. Patients presenting for their scheduled eye appointments will be recruited by verbal communication. Following informed consent, intraocular pressure (IOP) measurements will be made by the following methods: Standard Goldmann Applanation Tonometry (GAT): this is the standard method for IOP measurement in clinical practice. The eye is given topical fluorescein/anesthetic, the GAT prism contacts the eye while the observer looks through the slit lamp machine ocular using blue light illumination to visual the applanation mires. The GAT dial is adjusted until mire align…
Eligibility
- Age range
- 18+ years
- Sex
- All
- Healthy volunteers
- No
Criteria: Inclusion Criteria: * Presenting for a routine eye exam * ≥ 18 years of age * Able and willing to give consent Exclusion Criteria: * History of corneal scarring * Active infection of the eye * Ocular surface trauma or infection
Interventions
- DeviceStandard GAT
Standard Goldmann Applanation Tonometry (GAT): this is the standard method for IOP measurement in clinical practice
- DeviceFixed force GAT
An investigational device similar to standard GAT
- DeviceUpright applanating prototype
An investigational device, prism used in standard and fixed-force GAT is attached to a portable device
- DevicePneumotonometer
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
Location
- Duke Eye CenterDurham, North Carolina