How long it takes to go blind after a retinal detachment is closely related to the site of the detachment and the extent of the detachment. The problem should be analyzed on a case-by-case basis, and no generalization should be made. Retinal detachment refers to the separation of the retinal neuroepithelium from the pigment epithelium, which will affect the transmission of visual information and thus cause vision loss. The macula is the most sensitive area of the retina for light perception. If there is a large scale retinal detachment in this area, it will seriously affect the vision. Retinal detachment in the peripheral part of the retina has a relatively small impact on vision and the disease progresses relatively slowly, which may lead to blindness in about 6-12 months. After the occurrence of retinal detachment, patients need to go to the ophthalmology department of a regular hospital for examination in time to clarify the cause of the disease and then undergo surgery in time to avoid blindness.