Cone cornea is an eye disease characterized by a thinning of the central cornea that protrudes forward in a conical shape. It often results in highly irregular myopic astigmatism and varying degrees of visual impairment without inflammation. The disease occurs most often in young people in their 20s, usually with sequential onset in both eyes, and the cause is unknown. It has been suggested that it may be a genetic developmental abnormality, while others have reported that the disease is associated with endocrine disorders and allergic diseases. Early stage cone keratoconus has a slow onset and is characterized by increasing myopia, with patients requiring frequent eyeglass replacement and no other obvious self-conscious symptoms. In the middle stage of cone keratoconus, it is characterized by anterior corneal protrusion, progressive corneal thinning leading to irregular corneal shape, and patients experience significant loss of visual acuity, monocular diplopia, dark shadows, photophobia, glare and other discomforts. Advanced cone corneas are characterized by destruction of the anterior elastic layer of the cornea, superficial stromal scar formation, severe vision loss, and unsatisfactory correction by frame glasses. The most effective methods are corneal topographer and Pentacam, a panoramic analysis of the anterior segment of the eye. Myopia caused by early cone corneas can be satisfactorily treated with general frame glasses. However, when the patient has irregular astigmatism, the general frame glasses are no longer able to improve the vision, so it is necessary to choose the appropriate high oxygen permeable rigid corneal contact lenses RGP lenses, which are specially designed for patients with cone keratoconus. RGP lenses should be fitted and followed up in a regular hospital optometrist. Strict fitting inspection and evaluation, reasonable lens design, standardized operating procedures and education, and a complete follow-up system are important to avoid complications such as corneal abrasions, infections, and lens loss. When conical cornea develops to an advanced stage, corneal transplantation should be performed. Current international reports on clinical studies of patients with progressive cone corneas treated with UV riboflavin crosslinking have shown some control of cone corneal progression but not improvement of visual acuity. In addition, not all high astigmatism is a cone cornea. Some high regular astigmatism excludes cone cornea after corneal topographer and anterior segment panoramic analyzer, and can be corrected with excimer laser surgery for astigmatism, but requires strict consultation with a specialist. The main symptoms of astigmatism are vision loss and visual fatigue. Astigmatism is generally quite stable and does not increase with age. If there are more than 200 degrees of astigmatism, the image will be partly clear and partly blurred, and there is a habit of squinting. Children under the age of six should be examined early, vision screening process found in the problem of high astigmatism, we should wear glasses for astigmatism early, to avoid amblyopia Cone cornea: 1, early refractive error is the main, the beginning of myopia, gradually developed into astigmatism or irregular astigmatism, general lenses can be corrected; 2, medium-term vision further decline, general lenses can not be corrected, must use contact lenses To correct visual acuity. Slit lamp examination shows that the central tip of the cornea gradually thins and protrudes forward, sometimes the posterior elastic layer ruptures, atrial water invades, and the corneal stroma can become edematous and cloudy; 3, in the late stage, the tip of the cornea often forms irregular linear scarring or clouding, and the superficial layer of the cornea has new blood vessels growing into it, with a high degree of vision loss, and contact lenses cannot correct the vision.