If a retinal detachment is left untreated, it usually progresses to blindness in about a few days to two months, with the exact prognosis depending on the severity of the patient’s condition. The speed of progression of retinal detachment is mainly related to the location and size of the retinal tear. Retinal detachment formed by a retinal tear in the upper part of the retina progresses relatively quickly because the subretinal fluid expands rapidly under gravity toward the healthy area of the retina, while retinal detachment formed by a retinal tear in the lower part of the retina progresses relatively slowly, and blindness usually occurs within a few days to two months. Once a retinal detachment is diagnosed after fundoscopy and ultrasound examination, the patient should undergo surgery to reset the retina and close the retinal tear as soon as possible, in order to save visual function and avoid blindness. It is recommended that patients with retinal detachment seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.