Icare Tonometry Effects on Keratometry Readings, Topography Readings, and Corneal Staining

Four sites will enroll fifteen subjects each. Individual sites will identify their patients using numbers 1-15. The link to their identity will be stored in their records but will not be forwarded to other investigators. Only the originating site will have the identity log linking the participants to the study records. All patients over age 18 in the patient clinic are eligible for inclusion. Staff members and employees may also participate. Following informed consent, each patient will undergo visual acuity testing, keratometry readings by IOL Master, topography testing by Pentacam, and corneal staining evaluation with fluorescein using the Oxford scoring scale on both eyes. Once all three tests are completed, the Icare tonometer will be used to check the intraocular pressure (IOP) on one eye only. The investigator will be masked as to which eye will undergo applanation. Immediately following the IOP check, corneal staining, topography and keratometry readings will be repeated. The unchecked eye will serve as a control as there may be mild variations in topography or IOL Master even without applanation. Following the repeated testing, the control eye will also undergo applanation to document IOP.