You can't. The causes of blindness should be determined in time under the guidance of doctors, and appropriate treatment methods should be taken according to the causes. If the cataract caused by lens opacity leads to blindness, the lens can be replaced, that is, intraocular lens replacement; If the eyes are blind due to keratopathy, corneal replacement, that is, corneal transplantation, can be performed, but there is no treatment for eyeball replacement. Cornea and sclera together constitute the outermost fibrous membrane of eyeball, which has an important protective effect on eyeball. At the same time, the cornea is also an important refractive stroma, which is the only way for external light to enter the eye and image on the retina. The blood vessels of corneal limbus mainly supply the peripheral part of cornea, and the oxygen, nutrients and metabolites of cornea are removed through aqueous humor, tears, air and conjunctival blood vessels.