I have huge issues with my eye sight changing. It used to drive me nuts. I have slowly realized that different sorts of stress make it change. Like, one type of stress makes me nearly blind in one eye. Maybe not blind, but it feels like a hole has been bored into my left eye. Other stresses change it other ways. So for me, different stresses make my eyesight different. I don't think its a parts thing.
I see different colors with one eye.
I also know that fluid intake is a big one for me. They go wonky when I don't drink anything .
I keep going to the optometrists and they say my eyesight hasn't changed much. They said fluid and exercise and healthy diet. Yeah, right.
Sometimes I can read w/o glasses, but not too often anymore.