Scotoma is an area of decreased or lost vision.
When discussing Migraine disease and other headache disorders, we generally see scotoma listed as a possible visual symptom of Migraine aura.
You can read more about the symptoms of Migraine and Migraine aura, including scotoma in:
Teri Robert is a leading patient educator and advocate and the author of Living Well with Migraine Disease and Headaches. A co-founder of the Alliance for Headache Disorders Advocacy and the American Headache and Migraine Association, she received the National Headache Foundation’s Patient Partners Award and a Distinguished Service Award from the American Headache Society. Teri can be found on her website, and blog, Facebook, Twitter, StumbleUpon, Pinterest, LinkedIn, and Google+.