Foods that are healthy and normally needed by humans are good for the eyes, such as green foods or purple foods that are eaten in daily life are good for the eyes. The light-sensitive cells of the retina need a lot of lutein, and there is more lutein in purple foods. If you have frequent vision fatigue or overuse of eyes, you can take lutein-rich foods such as blueberries or tablets or capsules containing lutein orally. Vitamin B12 is an essential product for nerve nutrition. If you have diseases such as inflammation of the optic nerve or macular degeneration, you can take foods with more vitamin B12 orally for symptomatic treatment.