What Causes Black And Grey Dots In The Right Eyes?

Question : For over a year I have been periodically experiencing the following symptoms. Typically these symptoms occur in the morning and last several hours. I will see tiny black or grey dots in my right eye only. These are not regular floaters, they are much smaller than floaters. They cover my whole visual field. They move around with eye movement. If my eye is still, they flow downward. Usually I don't notice the dots and they don't hamper my vision but sometimes the effect is bad enough to affect my ability to drive. This can occur once a week or more often. When I look at an object with my right eye only, or my left only, I notice that the object is not as bright when viewed with my right eye. If looking at a light for instance, it doesn't look as bright with my right eye. In the past few days, the lower eyelid on my right eye has begun to twitch, as if a muscle is pulling on it. I started using Latanoprost in my right eye about a year and a half ago because the pressure higher than my ophthalmologist liked.