What happens during a glaucoma test?Glaucoma is usually diagnosed with a group of tests, commonly known as a comprehensive eye exam. These exams are most often done by an ophthalmologist. An ophthalmologist is a medical doctor who specializes in eye health and in treating and preventing eye disease.A comprehensive eye exam includes:Tonometry. In a tonometry test, you will sit in an exam chair next to a special microscope called a slit lamp. Your ophthalmologist or other health care provider will put drops in your eyes to numb them. Then you'll rest your chin and forehead onto the slit lamp. While you are leaning into the slit lamp, your provider will use a device on your eye called a tonometer. The device measures eye pressure. You will feel a small puff of air, but it won't hurt.Pachymetry. As in a tonometry test, you'll first get drops to numb your eye. Your provider will then use a small device on your eye called a pachymeter. This device measures the thickness of your cornea. The cornea is the eye's outer layer that covers the iris (colored part of the eye) and the pupil. A thin cornea may put you at higher risk for getting glaucoma.Perimetry, also known as a visual field test, measures your peripheral (side) vision. During perimetry, you'll be asked to look straight ahead at a screen. A light or image will move in from one side of the screen. You'll let the provider know when you see this light or image while still looking straight ahead.Dilated eye test. In this test, your provider will put drops in your eyes that widen (dilate) your pupils. Your provider will use a device with a light and magnifying lens to look at your optic nerve and check for damage.Gonioscopy. In this test, your provider will put drops in your eyes to both numb and dilate them. Then your provider will put a special hand-held contact lens on the eye. The lens has a mirror on it to let the doctor view the inside of the eye from different directions. It can show if the angle between the iris and cornea is too wide (a possible sign of open-angle glaucoma) or too narrow (a possible sign of closed-angle glaucoma).
