When I Switch The Light On There Are Millions, Millions

when I switch the light on there are millions, millions of entities moving, they are like pinheads, I extend my hand to reach them and nothing, there are not there. I also have problems with my depth perception. Sometimes i cannot accurately establish the position of an object in my field of vision. It is like I wanted to grab a glass of water and i missed it, extending my hand before or after the object.
My name is Peter F. I am a 69-year old male, with Parkinson disease's brain surgery (SBS Deep Brain Stimulation); enlarged prostate, and another old man issues.