Madurai-based Aravind Eye Care hospitals are known all over the world for their philanthropic work in the fiercely commercial world of healthcare. They hold the world record of conducting over 4 million eye surgeries, a majority of them done at cheap cost, or free of charge. Chairman P. Nalperumalsamy, a Padmashri, has been the leading light of this institution for long, so much so in 2010, Time magazine named him as one of the 100 most influential people in the world. In a relaxed interview with Arindam Mukherjee, the 73-year-old group patriarch stresses that the government needs to tighten control over private sector educational institutions while simultaneously strengthening public sector colleges. Excerpts: