Astigmatism after wearing OK lenses may be caused by corneal damage, OK lens misalignment, conical cornea, etc. The principle of OK lenses is to reshape the corneal epithelium to affect the refractive power. The principle of OK lens is to reshape the corneal epithelium, which affects the refractive power after changing the shape, which itself will be accompanied by astigmatism, and long-term wearing may also cause corneal damage, such as corneal scarring. According to the principle of vision correction by OK lenses, once improperly fitted or shifted, the cornea will be abnormally pressurized, which will cause inconsistent refractive power in all directions and astigmatism in the eyes. As a common eye disease among adolescents, conical cornea is characterized by dilated thinning and conical protrusion of the cornea in the center of the cornea, which often results in a high degree of astigmatism and seriously affects vision. Astigmatism is the difference in refractive power of the eye in different directions, usually caused by irregular shape of the cornea. If astigmatism occurs after wearing OK lenses, it can be left untreated when the symptoms are mild, and seek medical attention when the vision is seriously affected to avoid delaying the condition.