Retinal vein occlusion is clinically known as retinal vein occlusion, and in the late stage of the disease, patients may have symptoms such as distortion of vision, vision loss and visual field defects. 1. Deformation of vision: patients with retinal vein occlusion may have macular edema, which is mainly caused by the obstruction of blood return due to retinal vein occlusion, and patients may have symptoms of distortion of vision, blurring of vision, and other ocular discomforts. 2. Loss of vision: Retinal vein occlusion may cause flame retinal hemorrhage and loss of vision. 3. Visual field defects: retinal vein occlusion patients may also have visual field abnormalities, which are mainly manifested as visual field defects and dark spots in the visual field and other uncomfortable symptoms. It is recommended that patients with retinal vein occlusion consult a doctor to evaluate their condition and follow the doctor’s instructions to avoid permanent vision loss.