In this type of recognition, the capillary vessels of retina located at the back of the eye of an individual is analysed. The pattern of the capillary vessels of the retina are very complex and unique in every individual. The configuration of the blood capillary vessel is different even between the identical twins. Generally infrared light is used in retinal scanner. These types of bio-metric verification are used in many places like banks, ATMs, airports, government agencies, etc.