The raw diet alone is not a cure for every disease. Only the body can heal itself, and it will, if given the proper conditions and inputs necessary for healing.
Myopia has its cause in tension around seeing, the eyeballs become distorted in shape because of muscular tension in the head and skull around the eyeballs. Some people have success with healing their myopia with heavy palming, to reduce the tension in the eyes.
If you are starting to trying hard to see, this will only increase the muscular tension around the eyes.