Older people often think that when they reach a certain age, their vision loss is a normal eye function decline, and they take it for granted that it is caused by lens clouding or cataract. Indeed, cataract is the most common factor that causes vision loss in the elderly. With the gradual popularization of cataract ultrasound emulsification surgery and the extensive implementation of China’s cataract charity restoration project, cataract has become well known to the elderly as a non-blinding eye disease. Some people think that it is too late to have surgery when they can’t see well enough to affect their lives, while others are worried about the surgery and will not choose surgery until they can’t identify the direction. If we treat the human eye as a camera, then the crystal is only one of the lenses that make up the refractive system of the camera, and the clarity of the lens is important. However, if there is a problem with the camera’s camera obscura, that is, the fundus of the eye, it naturally affects the imaging of objects directly. Hypertension and diabetes are common diseases in the elderly, and the changes in the eyes of these systemic diseases are usually manifested as retinal hemorrhage and edema in the fundus, and the resulting blurred vision is easily mistaken for cataracts in the elderly. Some specific fundus diseases, such as age-related macular degeneration and retinal detachment, are often accompanied by visual distortion, dark shadows and visual obscuration in addition to blurred vision, which may delay the critical time for treatment if not taken into account as cataract, and irreversibly miss the hope of restoring sight. A few days ago, an old couple in their seventies came to the clinic. The old man was hard of hearing and could not express himself clearly, so the old woman said on his behalf that her partner could not see well in one eye, and that many elderly people in the village had recovered their vision through cataract surgery and wanted to come for surgery. After examination the vision of one eye was only light perception, but the symptoms obviously did not match the severity of the cataract. The retinal green-gray bulge was faintly visible in the fundus of the eye, and the ultrasound examination confirmed the retinal detachment. The stakes of the condition were immediately communicated, and they were not ambiguous and were immediately hospitalized. The surgery took the form of cataract ultrasound emulsion extraction combined with vitrectomy retinal repositioning. Intraoperatively, the retinal detachment was found to be about 3/4 of a week in extent, with a larger horseshoe-shaped fissure in addition to the macular fissure. Although the old man felt that he could not see clearly for more than one month, he said with a smile on the third day after the surgery that he could see clearly, and his visual acuity had exceeded the one-meter index on first check. Although he did not have as good visual acuity as cataract patients after surgery, he was very satisfied. This is just one case where the recovery is still ideal and the real cause of the disease is a retinal disease that can lead to blindness. Some of them have advanced retinal hemorrhage with massive neovascularization, and some have old retinal detachment combined with uveitis, because the best time for treatment is missed. Therefore, if the elderly suddenly visual blurred aggravated, or accompanied by visual distortion, visual obscuration, especially suffering from hypertension, diabetes and other common diseases, the emergence of these unusual symptoms remember to go to the hospital in time to get the right treatment, to avoid delaying the disease caused by lifelong regret.