I had cataract surgery in one eye with a corrective lens implant. When I run long distances, my vision in that eye becomes very foggy, almost to the point to where I can't see very well. After a couple hours after the run, my vision returns to normal. I never had that before until I had this surgery. I am reluctant to have the other eye done for fear that I will be in the woods (I am a trail runner) and won't be able to see. What could be wrong?