Diabetes and blurry vision. Diabetes refers to a complex metabolic disease in which your body either can’t produce insulin, doesn’t produce enough insulin, or simply can’t use it efficiently. Blurry vision after LASIK. Your vision may be blurry or hazy immediately after LASIK or any other type of refractive surgery. Clarity should improve within a couple of days, but it may take several weeks for your vision to stabilize completely….