Indoor allergens are usually what causes itching of the eye. Ensure your house is cleaned often. Avoid direct contact with dust. A blocked tear duct can cause continuous watering of your eye, paired with irritation and constant itching. Outdoor allergens like pollen and animal dander can also contribute to sever itching. If you use contact lens, that can be another cause for the development of allergies. Also, be careful of the eye makeup and face wash you use. Allergic reactions to them are quite common.
-Dr Priya Menon, an Ophthalmologist