Sir, my relative was born without one eye ball.now he is 17 years old.is there any way of fixing fake eye for him ?

Fake eye: As long as the orbit is still good then its quite possible. Please have him see an eye surgeon.

Yes: Almost always a prosthetic eye can be fashioned. If your cousin was born with a small or deformed eye then probably the socket did not develop properly leaving him with a cosmetic issue. Nevertheless he should see an ocularist and possibly an ocular plastic surgeon.