The sclera is the outermost layer of the eye wall, composed of dense collagen and elastic fibers with a hard, magnetic white texture, and mainly serves to protect the eye. Its surface is covered by the bulbar conjunctiva and fascia without contact with the outside world, and there are few blood vessels in the deeper layers. When the sclera becomes thin, it cannot effectively cover the brownish-black choroid in the eye, and when viewed in natural light, it becomes light blue. This phenomenon is called blue sclera. Patients should pay attention to their diet: 1. Eat more foods containing vitamin A, such as carrots, green and yellow vegetables and red dates; 2. Eat more foods containing vitamin B, such as sesame, soybeans, fresh milk and wheat germ. 3, eat more foods containing vitamin C, calcium and iron, which are essential nutrients for healthy eyes. 4, eat less high fat, high sugar, spicy, fried food and alcohol, coffee and other stimulating drinks. 5, to eat more light fruits and such, to clear the eyes. 6, eat more clear and moist products, so that the bowel movement is smooth, conducive to guide the fire evil downstream. 7, usually avoid eating spicy, fatty, sweet, nourishing and greasy products. 8, the heat is very toxic, it is more appropriate to avoid eating fishy things, otherwise it will help the heat of the disadvantages of fire. 9, to abstain from smoking and alcohol, so as to avoid spicy heat to help the fire.