Retinal detachment is a very serious disease that affects vision, causing a black fog to appear in front of the eyes that significantly impairs visual function. If retinal detachment is not treated promptly, the eye will gradually lose vision until it finally loses all perception of sight. There are currently three causes of retinal detachment. The common cause is rhegmatogenous retinal detachment, which refers to the appearance of a tear in the retina leading to its detachment. Another type is tractional retinal detachment, commonly seen in diabetic retinopathy and other proliferative retinal disorders, where the retina is pulled away. There is also exudative retinal detachment. All require careful examination by a qualified doctor followed by timely treatment.