Most eyesight problems are, despite widespread beliefs otherwise, entirely functional disorders. People with clear vision do certain things that people with blurry vision don't, and people with blurry vision do certain things that those with clear vision don't. Learning to see the way that people with clear vision do is the basis for seeing clearly.
For whatever reason, you have gotten stuck in an abnormal way of using your eyes, causing your visual system to go haywire. Further complications and side effects can result from this, giving people the illusion that it is a complex problem or that their eyes themselves are degrading and likely beyond repair, leading them to resort to measures even more drastic than glasses such as surgery. Although it's possible that you have caused long-term problems that may take some time to address, the poor vision that people experience is commonly held in place continuously simply by the dysfunctional process of seeing they have gotten used to, and this process can be adjusted to eliminate the conditions.
Fortunately, the correct way to see is easy. It only needs to be practiced and adjusted to. This article attempts to describe the basic process of adjusting your way of seeing.