To get a diagnosis of glaucoma, you will need to see an ophthalmologist, a doctor who specializes in eye diseases, for an eye exam. The ophthalmologist will gather information and perform a variety of tests, which might include: Asking questions about your family history Checking your vision, including using perimetry for your peripheral vision Measuring the pressure in your eye using tonometry Performing a pachymetry test to measure the thickness of your cornea Using ophthalmoscopy to examine your eyes for optic nerve damage Performing gonioscopy to see how open the area of the eye that drains fluid is