Lack of light in the eyes is firstly considered as a result of poor visual function, and the conjunctiva of the eye, such as corneal leukoplakia, may also show a lack of luster in the cornea. Most patients are suffering from refractive error and the deeper the degree, the worse the vision and the inability to see objects. If it is caused by various fundus pathologies, timely symptomatic treatment is needed. If the cornea is cloudy and edematous due to various reasons, the cornea loses its normal luster and appears lightless. It is also associated with systemic conditions, such as hypoglycemic reaction, vertigo, and fatigue syndrome. Usually pay attention to rest and avoid eye fatigue caused by prolonged close up viewing.