Hello Please remove this notion from your mind that masturbation has caused these problems in you. Masturbation is a healthy practice and generally people with guilt in their heart feel bad about it. This guilt comes from believing in myths. As far as weakness of body and eyes are concerned do the following Consult a eye doctor Take good nourishing diet. Do regular exercises Get certain investigations done after consulting your doctor to look for snyder deficiency in body. Relax and enjoy your life and don t get depressed Thanks