Vitamin C has a nutritional and protective effect on the eyes. Vitamin C is an essential nutrient for the body to maintain normal function and has antioxidant properties. A deficiency of vitamin C can lead to a range of diseases such as scurvy, cataracts, and hemorrhaging of eye tissues. For eye health, vitamin C supplementation can play the role of antioxidant, anti-aging, and promote the repair of tissue damage. Therefore, vitamin C supplementation has the ability to prevent cataracts from occurring in the eye. Vitamin C can also nourish the retina, which is helpful and protective in preventing the occurrence of macular degeneration and other diseases. However, patients must be examined in the hospital and used under the guidance of the doctor. It is recommended that patients go to the ophthalmology department of regular hospitals for consultation and use under the guidance of doctors.