How can i fix or recover eye sight?

Depends: On why the eye sight is lost. Some things are fixable; others are not.

That depends : That depends on many things. The cause is the main problem. Some diagnoses are reversible, such as cataract, some types of corneal edema, refractive errors, etc. Some causes are not reversible, such as some retinal problems , glaucoma, amblyopia, etc. You need a good exam from an ophthalmologist to nail down the cause. That would then determine your answer. Good luck!