For the last few weeks I have what seems like flashes in my vision. It’s like someone is turning on/off a light switch or it’s like lights flickering in the background. I saw an Optometrist and Opthalmogist. They both dilated my eyes to check my retina and everything is fine. The Opthalmologist is referring me to a retina specialist although she doesn’t think it’s necessary. Any idea what this could be?