Retarded light reflex is a test to check the functional activity of the pupil, which is divided into direct light reflex and indirect light reflex. For direct light reflex, a flashlight is usually used to directly illuminate the pupil and observe its dynamic response. In normal people, the pupil narrows immediately when the eye is stimulated by light, and recovers quickly when the light source is removed. Indirect light reflex refers to the fact that when light shines on one eye, the pupil of the other eye immediately narrows, and the pupil dilates when the light is removed. When checking for indirect light reflex, one hand should be used to block the light so that the examining eye is not exposed to the light and a direct light reflex is formed. Diet that can improve the symptoms of delayed light reflex: 1, rich in vitamin A food: lack of vitamin A eyes to the dark environment of the adaptive capacity of the reduced, serious cases of easy to suffer from night blindness. And vitamin A can also prevent and treat dry eye disease. 2, vitamin B group rich food: the eyes of the retina in the storage of a considerable amount of free vitamin B2. if the baby vitamin B deficiency, will lead to eye photophobia, tearing, burning pain and itching, visual fatigue, eye curtain spasm. 3, rich in vitamin C food: vitamin C is one of the components that make up the lens of the eye, the vitamin can also effectively inhibit cellular oxidation, lack of vitamin C is easy to make the baby’s eyes dry. 4, calcium-rich foods: calcium has the role of eliminating eye tension, can relieve eye fatigue. 5, protein-rich foods: protein is the main component of the composition of cells, tissue repair and renewal requires constant supplementation of protein. Eating more protein can make the baby’s eyes bright.