A Survey on Detection of Macular Retinal Edema

Retinal images of humans play an main role in the detection and diagnosis of many eye diseases for ophthalmologists. Diabetic Retinopathy is a severe and largely spread eye disease which can be regarded as manifestation of diabetes on retina. Retinopathy exactly means damage to retina. There are two types of retinopathy.The most common type is background or non proliferative diabetic retinopathy.A feature extraction technique is introduced to capture the global characteristics of the fundus images and inequity the normal from DME images.Exudates are the primary sign of diabetic retinopathy.So detection of exudates is very important in diagnosis of diabetic retinopathy.While detect the exudates, segmentation of blood vessels in retinal images is necessary