Parece que sim, apesar de que pode ser um efeito benéfico do estilo de vida das pessoas que tomam chá todos dias (dizem os investigadores):
https://consumer.healthday.com/senior-citizen-information-31/glaucoma-news-335/could-a-hot-cup-of-tea-preserve-your-vision-729416.html
Citando:
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The study of U.S. adults found that people who drank hot tea on a daily basis were 74 percent less likely to have glaucoma, compared to those who were not tea fans.
Experts were quick to stress that it may not be tea, itself, that wards off the eye disease. There could be something else about tea lovers that lowers their risk, said senior researcher Dr. Anne Coleman.
But the findings do raise a question that should be studied further, according to Coleman, a professor of ophthalmology at the University of California, Los Angeles.
"Interestingly," she said, "it was only hot, caffeinated tea that was associated with a lower glaucoma risk."
Decaf tea and iced tea showed no relationship to the disease. Neither did coffee, caffeinated or not.
It's hard to say why, according to Coleman. "Is there something about the lifestyle of people who drink hot tea?" she said. "Do they exercise more, for example? We don't know."
Glaucoma refers to a group of diseases where fluid builds up in the eye, creating pressure that damages the optic nerve. It's a leading cause of blindness in older adults, according to the American Academy of Ophthalmology (AAO)
Some people face a higher risk than others, the AAO says: They include blacks, people with a family history of glaucoma, and people with high blood pressure, diabetes or other conditions that affect blood circulation.
Some studies have suggested that people who drink a lot of coffee have a heightened glaucoma risk. Others have hinted that caffeine can temporarily boost pressure within the eye."
