Reduce eye puffiness
Tea bags contain caffeine, which can reduce swelling by constricting blood vessels. The heat from the tea bags soothes the skin around the eyes, helping to reduce swelling.
A study in the Journal of Cosmetic Dermatology showed that the caffeine in black or green tea can effectively aid in reducing puffiness.
Soothes irritated skin
Tea bags contain anti-inflammatory tannins that can soothe inflamed surfaces. This is helpful for people who suffer from red eyes or inflammation caused by dust or pollen. To relieve this condition, you can apply cold tea bags to your eyes.

Reduce dark circles
Dark circles are caused by poor blood circulation under the eyes and the antioxidants in tea can help reduce this condition. Using tea bags on your eyes will help brighten and soften the skin around your eyes.
Bring a sense of comfort
Using cold tea bags on your eyes can be very soothing. This will help to rejuvenate your eyes and make them feel more awake. A study published in the journal Pharmacophore found that using cold chamomile tea bags on your eyes can help reduce puffiness and provide a soothing sensation.
In addition to the above uses, using tea bags to apply on the eyes also helps protect skin cells from free radicals, which will help the skin around the eyes become healthier and help reduce signs of aging.