Dry, itchy and itchy eyes, how to relieve them?

(the picture comes from the Internet)

Swipe your phone and watch videos every day. Many friends have found that they do not know Unconsciously, my eyes became dry, astringent and itchy. Rubbing my eyes seemed to relieve it, but after a while it started to itch again.

Why are my eyes dry and itchy? How to alleviate it?