The results showed that different parts of the eye absorbed varying amounts of catechins. The area with the highest concentration of catechins was the retina, which is the light-sensing tissue that lines the back of the eye.
Antioxidant activity lasted for up to 20 hours after drinking green tea extract.
This is an animal study and we have no evidence that the same effect takes place in humans.
"Sip green tea all day; green tea usually contains about 25 percent as much caffeine as coffee and provides a steady stream of antioxidants." -- "Drink coffee for breakfast, tea in the afternoon, wine at 5 p.m." Source: http://www.npr.org/blogs/thesalt/2015/04/28/400156651/tea-tuesdays-tea-drinking-tips-for-a-longer-life