Eye allergies in winter are most often caused by indoor allergens such as mold, pet dander, dust, dust mites and other indoor air pollution.
The dust mites, dust, pet dander and mold and indoor air pollution becomes more concentrated indoors as you spend more time inside with less ventilation.
Dust mites are microscopic creatures which thrive in dust and are a common allergen, especially in carpet, upholstered furniture and even bedding.
The dried skin flakes that shed off of pets also known as pet dander can also trigger allergic reactions and lead to eye allergies and other allergies as they can float through the air.
Mold spores can also accumulate in damp areas such as bathrooms and basements and can make allergy symptoms worse.
And even smoke from cigarette smoking and even wood burning fireplaces can also lead to irritation of the eyes and make allergy symptoms worse.
Dry air is also common in homes and buildings during winter when the heat is on as the heat dries out the air and can lead to eye irritation and make your eyes more prone to allergens.
You can add some moisture to the air using a humidifier to keep the air from becoming too dry.
Even the cold air and wind can lead to eye irritation and strong cold winds can cause winter keratoconjunctivitis which can cause blurred vision, severe eye discomfort and light sensitivity.
During the winter you're exposed to low humidity air indoors and outdoors and the dry air just like it can damage the skin can also remove necessary moisture from the eyes as well.
Wintertime can also lead to dry eyes which can cause, itchy, red and irritated eyes which can get worse in colder temperatures.