This blog proposes a non-invasive electrophysiology test for early diagnosis of retinal disorders, its procedure and advantages. This blog presents an overview of how retina functions, retinal disorders, some of the existing methodologies for diagnosing them and the need for low cost, portable and non-invasive preliminary test for early diagnosis of abnormal retinal function. However the main content of the blog describes about the idea of low cost, non-invasive approach which is proposed for early preliminary diagnosis of abnormal retinal function. It provides a detailed explanation of the methodology, steps involved in the process, procedure of the test, its advantages over existing methods. It explains about the steps of this propsed approach such as Electrode placement, Stimulus, Signal acquisition and processing, result interpresentation, diagnostic measure and how the test should be performed for a patient in a hospital environment.