Retinal detachment is a serious and sight-threatening event, occurring when the retina becomes separated from its underlying supportive tissue. The retina cannot function when these layers are detached, and unless it is reattached soon, permanent vision loss may result. The leading symptoms of this disease are seeing flashing lights all of a sudden, noticing many new floaters at once. These can look like specks, lines or cobwebs in your field of vision, seeing a gray curtain covering part of your field of vision. You should be seen by a retinal specialist immediately, if you have any of these symptoms.