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Japanese research shows that drinking coffee can treat dry eyes

Published: 2026-08-22 Author: World Gafei

Last Updated: 2026/08/22, Researchers at the University of Tokyo School of Medicine in Japan studied 78 patients with xerophthalmia. In the first phase, half of the patients were given caffeine pills and the other half were given a placebo.

In recent years, studies have shown that drinking coffee can reduce the risk of cancer, diabetes, gallstones and Parkinson's disease. Now, Japanese researchers have found that caffeine can also treat dry eyes.

Xerophthalmia can cause pain and tingling, and some patients with severe xerophthalmia may even impair their eyesight. Researchers at the University of Tokyo School of Medicine in Japan studied 78 patients with xerophthalmia. In the first phase, half of the patients were given caffeine pills and the other half were given a placebo.

In the second stage, the two groups are exchanged. No one knows they're on caffeine. Six days before the study, the participants stopped eating any caffeinated food or other drugs to reduce the variable.

The results showed that patients' tears increased significantly as long as they took caffeinated pills. The researchers say the focus is not only on caffeine, but also on a person's ability to metabolize caffeine.

The researchers found that if there were two sets of variations in a patient's DNA, the body's ability to metabolize caffeine changed. After consuming caffeine, the body produces more tears. Not only tears, but by the same principle, caffeine also increases saliva and digestive juice secretion.

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For people who are often on the computer, xerophthalmia must be no stranger, the eyes are dry, congested, and extremely uncomfortable. Experts say xerophthalmia patients should drink more water and wear less contact lenses. Contact lenses can easily affect the circulation of tears and hinder the formation of tear film; contact lenses also absorb water, causing dehydration on the surface of the eyeball.

The main role of vitamin E is to reduce cholesterol, remove garbage from the body, and prevent cataracts. Walnuts and peanuts are rich in vitamin E. Vitamin B1 can nourish nerves, and green leafy vegetables contain a lot of vitamin B1. You can drink green tea and chrysanthemum tea appropriately every day, because the lipopolysaccharide in tea can improve the hematopoietic function of the body, and tea has the function of preventing radiation damage.

Eat more vitamin A: chrysanthemum is rich in vitamin A, which is an important substance to maintain eye health. Therefore, it is also a good medicine for traditional Chinese medicine to treat all kinds of eye diseases. Chrysanthemum tea can make people clear-headed, bright eyes, especially for liver fire, excessive use of eyes caused by dry eyes have a better effect. People who often feel dry eyes, especially those who often use computers, might as well drink more chrysanthemum tea.

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