I'm not having this problem, but I did a search on Bing.com and found several sites. I checked out wrongdiagnosis.com and also webmd.com. There were several possibilities mentioned... you've ruled out a couple of them. Vitamin A and Zinc deficiencies were mentioned... as well as diabetes. Have you seen an opthamologist or did you go to your internist? A specialist might be able to help you narrow it down better.
Good luck and please check into this further... your eyesight is so very important and checking into this problem is not something to be put off.
"Jesus Knows Me, This I Love!"
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