Vision that fluctuates may be due to a variety of conditions. One of the first things I think of when I get a complaint of fluctuating vision is systemic conditions, more especially Diabetes. If you find that sometimes your vision is ok, other times it’s not, sometimes you need your specs, other times you don’t, getting your blood glucose and your blood pressure checked is a good idea. It’s often the little things that give us clues to the big things. Dry eye syndrome can also cause a temporary blurring of vision due to excessive mucous production.  Don’t ignore any changes that you experience.