Lutein is a healthcare product and does not play a therapeutic role in eye diseases, therefore, there is no clinical statement on the specific time of effect on the eyes. Clinical advice can be based on the patient’s personal situation, appropriate to take lutein about 2 ~ 4 months. The specific time of taking lutein may vary depending on the patient’s physical condition, the absorption of lutein and the severity of the eye disease. If lutein is taken in excess for a long period of time, it may lead to the appearance of more particles or crystals of lutein in the macular area, which not only has no effect on the treatment, but also increases the risk of macular degeneration. Therefore, it is recommended to take additional lutein supplements under the guidance of a professional doctor and not on your own.