Bad eyes have some effect if they are eyestrain taking lutein, but if the bad eyes are caused by other reasons, taking lutein is usually ineffective. Lutein is a vitamin necessary for the metabolism of retinal cone cells and visual sensory cells, if this vitamin is deficient, the patient’s vision may be affected. Patients who usually eat a normal diet and are not picky eaters usually do not develop lutein deficiency. Some patients are deficient in lutein because of exertion or irregular diet. Patients can take lutein as prescribed by the doctor to promote retinal nutrition and improve retinal vision. If the patient’s poor vision is caused by diseases, such as cataracts that cause clouding of the lens, affecting the patient’s vision, etc., patients with this type of disease cannot improve their vision by taking lutein, and the treatment effect is not good. It is recommended that patients with poor vision seek medical attention in a timely manner to assess their condition, follow the doctor’s instructions to choose the appropriate treatment, do not take medication without authorization.