Elderly people who suddenly lose their eyesight may have retinal vasospasm, and their eyesight may be restored; it may also be retinal artery blockage, etc., and they should consult a doctor in time, and the possibility of restoring their eyesight without timely treatment is relatively small. 1. Retinal vasospasm: In this case, the eyes can not see for a relatively short period of time, usually a few seconds to a few minutes, vision can be gradually recovered on their own. 2. Retinal artery blockage: this is a more serious eye disease, the patient will suddenly appear vision loss, after resting the symptoms can not be relieved, this situation is caused by blood clots blocking the retinal artery. Therefore, when the elderly suddenly lose their eyesight, they should go to a regular medical institution for consultation, to clarify the cause of the disease, and to be treated under the guidance of the doctor, so as to avoid delaying the condition, which may lead to blindness.