Graying of the edges of the black eye may be a normal physiological phenomenon, which generally does not require medication, and may be caused by band corneal degeneration, which can be treated with medication or surgery. Graying of the edges of the black eye is usually genetically determined, and usually does not require medication if the body does not show any abnormal symptoms. The black eye is mainly made up of cornea, while the white eye is sclera tissue. The connecting part between cornea and sclera will form a layer called corneal rim, which is usually lighter in color than the black eye, so it looks gray. Ribbon corneal degeneration is mainly caused by calcium deposits in the anterior elastic lamina and anterior basal lamina of the corneal epithelium, starting from the anterior elastic lamina of the corneal limbus in the inner eyelid area, and there will be fine dots of grayish-white calcium deposits, which may be accompanied by symptoms such as foreign body sensation in the eye, irritation, and so on. It can be treated with medications such as disodium edetate eye drops, as well as lamellar corneal transplantation or excimer laser treatment. If the patient has the black part of the eye edge gray and accompanied by other discomfort, it is recommended to go to the ophthalmology department of the hospital as soon as possible, and follow the doctor’s instructions for treatment, medication, do not self-medication, in order to avoid adverse consequences.