Medical Image processing is extremely trendy research area now days in this category only digital images are diagnosed. Diabetic patients can have eye disease recognized as Diabetic Retinopathy. Diabetic Retinopathy(DR) is the general origin of sightlessness in middle and advanced mature group people. Therefore it is essential to identify Diabetic Retinopathy (DR) at the early stages and give suitable treatment according to the severity. It is a worldwide illness that affects equivalent to 80 percent of patients those are suffering with diabetes problem with minimum 10 years history. In Diabetic Retinopathy, these are the some components like hemorrhages, Microanurysms, hard and soft exudates. Currently a large number of computerized algorithms have been made to retrieve precise retinal blood vessel from fundus images. This paper presents the categorization the different stages of the Diabetic Retinopathy and different achievable retinal blood vessels segmentation algorithms and their examination are discussed.