While seeing dark from one eye is just one symptom of going blind, other symptoms might come gradually or slowly: - Double vision - Blurry vision - Seeing flashes of light - Seeing floaters or spider webs - Seeing halos or rainbows around lights - Seeing curtain coming down over one eye - A sudden decrease in vision - Sudden sensitivity to light and glare - Sudden eye pain - Itching or burning eyes - Red eyes - White areas in the pupil - Changes in the color of your eye Treatment options can delay the process and preserve your current condition. After diagnosing the cause of your vision loss, the proper treatment can be started effectively.