First of all, I think it is necessary to introduce the definition of strabismus. Strabismus is the eye problem, also called as crossed eyes or squint eyes. It refers to the misalignment of the two eyes. When one eye points at a direction, while the other eye points at a total different direction. The causes of strabismus vary a lot, including genetics, inappropriate development of the fushion center of the brain, disorder of the muscles, nerves and injuries. Although in most cases, it is caused by brain disorder, yet strabismus surgery is mostly to reach the alignment by adjusting the muscles. Strabismus surgery help patients to get good cooperation of the two eyes. It can slove the double vision as well as the monocular caused by squint. It indeed improves the binocular vision of the patients a lot,but it can't correct the refractive problems, such as myopia, astigmatism or hyperopia.
As we all know, myopia (also known as near-sightedness) and distance vision are two of the most common eye disorders. An eye suffering from myopia sees objects better close up rather than at a distance. It happens because the light rays are being "bent" too much or too soon and the image tends to be generated in front of the retina. DV is an abbreviation for distance vision, which also called presbyopia. Presbyopia is an aged related eye disorder. In presbyopia, your eyes gradually lose the ability to adjust to see objects clearly at different distances. Although the most common presbyopic symptom is blurry close-up vision, you may also experience blurred distance vision when changing your focus from near to far objects. Compared to myopia, distance vision cannot improve with age. On the contrary, it's almost possible to be caused by ages. However, both of them can be adjusted through wearing eyeglasses.