1. Lack of vitamin C and E predisposes to cataracts. Rich in vitamin C and food is plant seeds, such as peanuts, walnuts, pine nuts, dark green vegetables and various fruits. 2, lack of vitamin A susceptible to night blindness and dry eye disease. Foods rich in vitamin A are animal liver, cod liver oil, fish roe, milk products, eggs, green and yellow vegetables, fruits such as spinach, leeks, broccoli, green peppers, sweet potatoes, carrots, pumpkin, apricots, mangoes, etc. 3, lack of zinc ions and protein. Zinc ion-rich foods are animal liver, kidney and seafood, dairy, cereals, legumes, hard fruits, etc. Foods rich in and protein are lean pork, beef, mutton, chicken and duck, animal offal, milk, fish and bean foods.