A nevus almost never causes any symptoms. Very rarely, a choroidal nevus may leak fluid or be linked to the growth of abnormal blood vessels. These events can lead to retinal detachment, flashing lights and vision loss.
Even though most nevi don't have any symptoms, they still need to be watched regularly because, like a skin mole, an eye nevus could possibly become cancerous. That's why regular checkups with an Eye M.D. are so important.
Next Page: Nevus Diagnosis