Have you ever tested positive for HSV-1 by chance?
Is this more of a problem with one eye than the other?
Ocular herpes can cause floaters, light sensitivity, and even intermittent blurred vision (in one or both eyes). I experienced this in my left eye for many years before the cause was found (in my case HSV-1).
After I dealt with the viral infection, my symptoms got 90% better literally overnight.