I'm losing vision in my left eye gradually. It started with a black patch covering 1/4 of the top half and in a months time the whole vision was gone. For about a week I could see through this black cover in bright light like wearing sunglasses in a poorly lit room and now I can't see that. The most recent problem is how sore the eye has become. I can't rub it or press it without pain. It feels bruised and swollen though you can't tell by looking at it. Also the pupil is very small and does not dialate with light. Are these signs that the eye is dying or is it just a huge floater affecting my vision?