The central dark spot and the change of refraction, i.e., uveal malignant melanoma, are the most common malignant intraocular tumors in adults, accounting for the highest incidence of intraocular tumors abroad and the second highest in China after retinoblastoma. This disease can cause great damage to our eyes and affect our life. Therefore, in order to reduce the possibility of developing it, it is necessary to take preventive measures for fundus disease in our life. The right way: 1. Fundus lesions can occur in hypertension, hyperlipidemia, kidney disease, diabetes, certain blood disorders, and central nervous system diseases. Ophthalmologists will detect many problems from subtle changes in the fundus map, thus providing important information for diagnosis and treatment of systemic diseases. 2. Fundus is the only part of the eye where arteries, veins and capillaries can be directly and centrally observed with the naked eye, and these vessels can reflect the dynamics of blood circulation and the health condition of the whole body. Therefore, fundus examination is not only an important method to check the vitreous, retina, choroid and optic nerve diseases of the eye, but also a “window” for monitoring many systemic diseases. This is one of the methods of prevention of fundus diseases. 3, children and young adults are best to do a fundus examination once every six months, while the elderly and the “three high” people need to be examined once every three months. Before testing the fundus of the elderly, it is best to do an eye pressure test, because a comprehensive and detailed examination of the fundus of the eye sometimes requires a dilated pupil, and the elderly with high eye pressure and a tendency to glaucoma can not dilate the pupil. This is one of the ways to prevent fundus disease.