Hiii chaavi..

you need to be a little more specific here. Can a person with keratoconus join defense: yes, But not all the branches. The Infantry in the Army, Pilot in the AirForce and GS executive in the Navy along with pilots need you to have perfect vision. Whereas the other branches allow you to join as long as your visual disability can be corrected to normal.hope you like the answer...keep asking we are always looking for you to help