Happy b'day Ikka
From their website:
Padma Vibhushan: For exceptional and distinguished service;
Padma Bhushan: For distinguished service of a high order;
Padma Shri: For distinguished service.
All persons without distinction of race, occupation, position or sex are eligible for these awards. However, Government servants including those working with PSUs, except doctors and scientists, are not eligible for these Awards. The award seeks to recognize works of distinction and is given for distinguished and exceptional achievements/service in all fields of activities/disciplines.