This document discusses OpenEyes, an open source electronic patient record system developed at Moorfields Eye Hospital. It provides information on the motivation for developing OpenEyes to address issues with patient care, outcomes, research and teaching. It describes OpenEyes as a web application that allows frontline clinicians to enter structured data in real time. The document outlines the development process, timeline, usage rates and clinical engagement. It compares OpenEyes to other clinical systems and discusses the benefits and challenges of using an open source approach.