Diagnostic eye exams for glaucoma, include the visual field test (Perimetry), corneal thickness and angle tests to evaluate fluid drainage (Gonioscopy), optic nerve imaging (Slit Lamp and/or Optical Coherence Tomography), and the eye pressure check (Tonometry). The National Eye Institute recommends that people with Diabetes get a dilated eye exam every year. Early treatment can help stop your vision deteriorating severely.
- A visual field (Perimetry) test checks for missing areas of vision. Often it is the peripheral vision which is first affected by glaucoma.
- Gonioscopy is an evaluation of the fluid drainage system in the front of the eye between the iris and the cornea. A gonioscopy can help to determine whether this area (the “angle”) is open or closed (blocked), which can affect how fluid drains out of your eye. It will tell your optometrist what type of glaucoma you have.
- To determine the condition of the optic nerve which may become damaged in glaucoma an assessment will be carried out by placing eye drops to enlarge the pupils and an examination is carried out using slit lamp (a microscope with a bright light) or optical coherence tomography which is a scan of the back of the eye.
- Tonometry is a painless procedure that determines intraocular pressure, a tonometer measures the resistance of the eye to a puff of air.