If your pressure is high and/or there are signs of optic nerve damage, further testing will be ordered.  Visual field testing helps create a map of your vision to evaluate for any missing areas.  OCT scans are used to further evaluate the structure of the optic nerve.  Both tests are painless, are done in the office and usually are covered by insurance. These results are used to diagnose and stage glaucoma, and help determine the best course of treatment for your unique eyes and lifestyle.