In this lesson from Yale's Creating Change through Social Entrepreneurship course, students examine Aravind Eye Systems, a social enterprise that delivers high quality eye care at scale in India, including to patients who cannot pay. The lecture explains how Aravind adapted standardized, high volume production principles, comparable to a fast food chain's operating model, to deliver medical care efficiently while cross subsidizing free treatment for poorer patients through fees paid by wealthier ones. The case study illustrates the revenue model and operational efficiency concepts introduced in earlier lessons applied to a large scale healthcare social enterprise.