How can I tell if my retina is detached?

See ophthalmologist. Best way to know whether or not retina is detached is to have exam by an ophthalmologist.
Flashes floater veil. Vitreous separation & traction on the retina causes retinal tears-causing vitreous floaters & hazy vision. Laser helps to prevent the tear from progressing to a retinal detachment as fluid flows though untreated tears and the retina falls off the back of your eye-like wallpaper coming off a wall. This causes a veil in your side vision then central vision loss. It is painless.