You may wish to read the book ‘Infinite Vision’ by Dr. V (available via Amazon):
When a crippling disease shattered his lifelong ambition, Dr. Venkataswamy (better known as Dr. V) chose an impossible new dream: to cure the world of blindness. The tiny clinic he founded in India defied conventional business logic and is now the largest provider of eye care on the planet. At Aravind, patients choose whether to pay or not. Millions are treated for free, yet the organization remains stunningly self-reliant. Serving everyone from penniless farmers to the president, it delivers world-class outcomes at a hundredth of what similar services cost providers in advanced nations. Its model is emulated by organizations everywhere from Rwanda to San Francisco.