How can you treat blurry eyesight?

Depends on cause. First, the reason for the blur needs to be determined. There are far too many reasons for blurred vision to list. The most common is simply that you need a prescription, in this case, it can be corrected by glasses, contacts or laser treatment. If the problem is with the health of the eye, the treatment will depend on the nature of the condition. See your eye doctor to find the cause.