It's a double edged sword my friends. The FAA is in the business of promoting aviation and also enforcement. The DGCA hmmm, you decide for yourself. If you have a medical problem on an FAA license, there usually is a genuine effort to get you back in the cockpit if at all possible. Pilots with cancer, heart attacks etc have returned to duty after a haitus and required testing. A flew with a guys once with one eye. He lost his eye to a drunk driver and it took him a few years to get back into aviation. He had to go through a variety of tests including a checkride in the airplane at night to check his depth perception. He was given a demonstrated waiver and continued to fly for many years as a Captain. Another lost a leg to cancer, and came back after many years with a prosthethic. He too had to undergo tests, checkrides, V1 cuts etc to ensure he was capable.
He remains a Captain at a major airline.
Indian medical standards are tough as are those in other parts of Asia.
At Korean Airlines, it makes the Indians look pale in comparison. You find out things about yourself, you probably don't want to know!