Before my diagnosis I had 20:40 vision and had used eyeglasses for 30 years. In addition to that, I had vision problems that the ophthalmologist was monitoring by giving me various tests every 6 months. There were a few different types, and I remember one being field of view. I had high pressure in my eyes and she thought I might be developing glaucoma. After diagnosis and 6 months on a gluten free diet I returned to the eye doctor. My pressure was normal, my vision was 20:20 and she told me that I didn't need to come back anymore. I could see a optometrist if I felt that I needed reading glasses. I had already noticed that I could see better without my eyeglasses and had stopped using them. I didn't even need them for reading anymore. The ophthalmologist said that she could not explain why my vision had improved.
These days I notice my vision gets blurry as a sign of glutening along with my other symptoms. I don't have any confirmation of this from eye doctor, but it does seem to be related to ingesting gluten. It is always a good idea to check out problems with a doctor, but it does at least seem to be a possibility.