Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. You must understand that masturbation is natural and normal. Masturbation alone cannot be the cause of general weakness and sexual problems. Also it cannot lessen your eyesight. Ideal masturbation habit could be up to once per day. Don t worry about the masturbation practice. You are unhealthy because of your food habits and because of the anxiety related to masturbation practice. Don t worry. Please concentrate in your studies and career. Forget about sex and masturbation or don t live for that. For sexological and psychological counseling and for different psychotherapy treatments visit http://psychocure.webs.com/ Hope this answers your query. Available for further clarifications. Good luck.