There are several possible causes, including:
1. You may have allergic conjunctivitis. The symptoms of allergic conjunctivitis are itchy eyes, swollen conjunctiva, congestion in conjunctiva, and goopy eyes. It happens every now and then. Patients' eyes are sensitive to season changes.
2.Video display terminal syndrome: In winters, the air is dryer. If you stare at the screen of computer, TV or other digital products for too long, plus a lack of sleep, your eyes get tired and fail to be lubricant enough, then you have itchy eyes.
3.There may also be a lack of a certain nutrition in your diet. In this case just keep a balanced diet.
Anyway, in dry winter, you must drink enough water for the sake of your health. Don't forget to have a rest internally in case your eyes get overloaded.