For several days I have been having blurry vision occasionally ( sometimes it's ok but sometimes I feel blurry vision) I feel whenever I eat curd or milk I feel this blurry vision or head ache, some kind of stomach blotted ness I have already consulted eye doctors 2-3  they did some tests with instruments that concluded everything normal But I am having this blurry vision Are there any other reasons for this blurry vision I feel over tiredness in my eyes and mild pain in eyes when this blurry vision happens Please help me to find a cure