Glaucoma is often associated with a build-up of pressure inside the eye. Glaucoma can be inherited and may not show up until later in life.
The increased pressure, called intraocular pressure (IOP), can damage the optic nerve, which transmits images to the brain. If damage to the optic nerve from high eye pressure continues, it will cause vision loss in the periphery leading to tunnel vision and eventually total vision loss.
Because most people with glaucoma have no early symptoms or pain from this increased pressure, it is important to see your optometrist regularly so that glaucoma can be diagnosed and treated before long-term visual loss occurs.
If you are over age 40 and have a family history of glaucoma, you should have a complete eye exam with an optometrist every year. If you have health problems such as diabetes or a strong family history of glaucoma or are at risk for other eye diseases, you may need to visit your optometrist or ophthalmologist (eye surgeon) more frequently. They may recommend Fundus Photography to look closer at the back of your eye to determine the stage of your Glaucoma.
Above is what the Optometrist sees at the back of the eye. They are looking for Optic nerve damage. The Puff Tonometer (The instrument that blows air into your eyes) measures the intraocular pressure commonly referred to as IOP.