Migraine, ophthalmic
Migraine involving the eyes but without headache.
Migraine, due to a spasm of blood vessels in the brain, usually causes a headache.
Flashes of light may appear as jagged lines or 'heat waves' in one or both eyes and often last 10-20 minutes, sometimes without a headache.
This is termed ophthalmic migraine, or migraine without headache.