I have an eyesight of 0.5 inone eye and other one is fine so i wanted to ask how often should i wear my spectacles in daily life and is there any to recover my eyesight from 0.5 to 0

Basics: your post is confusing since in our country vision is reported as clarity at 20/20, 20/30, 20/40 and so on. If your eyes have more than one such level difference you should wear glasses at most times. Failure to do so can cause the brain to select the better eye & gradually turn of input from the other (amblyopia).Lasik surgery can correct vision but it may be good to wait a while.