Now i am 38 i losing my eye sight frequently so please tell me how to prevent?

Visual loss: their can be many causes of visual loss ranging from drinking poisons to stokes of the optic nerve. You need to see an Ophthalmologist. A physician, MD, who specializes in diseases of the eye. It would be best to see that physician right away, even if you have to travel to do so.

Amaurosis Fugax: The intermittent loss of vision=amaurosis fugax. Any loss of blood flow to the eye or rapid elevation in intraocular pressure can cause this kind of sudden, transient vision loss. In both cases, the vision loss might not come back after an episode, so see an ophthalmologist to evaluate for narrow angles or another cause of vision loss. In India, go to Aravind Eye Hospital.