The causes of transient blindness and recovery include spasm of retinal arteries and upright hypotension. The retina is supplied with nutrients and oxygen by the retinal arteries. Spasm of the retinal arteries can lead to ischemia and hypoxia of the retina, which affects the function of the retina and results in transient blindness, and then the retinal vasospasm is lifted and the blood supply is restored, and the vision is restored. Upright hypotension is caused by a sudden drop in blood pressure when the patient suddenly stands up from a lying or sitting position, resulting in temporary insufficient blood supply to the brain, which affects the function of the visual center and causes transient blindness, and then with the blood supply to the brain resuming after the blood pressure is raised, the vision can be restored. The patient should go to the ophthalmology department of the hospital for examination in time, and after a clear diagnosis, the doctor will formulate a reasonable treatment plan.