My prescription changed within a month after getting this, which was 3yrs ago. I saw a Neuro Opthamologist(?), and I was given a different prescription. Most of my vision is clear, but with what I have (if I for sure have PN), my vision will still change with physical demands, stress, etc. I get blurry vision, but not what I used to have, since getting corrective lenses. It's not 100%, I still have things such as items across the room, etc that become blurry, but I deal with it. I can still see them, they just aren't HD. LOL You can get through this, with patience and determination.