Yes, ‘tis the season of itchy, red, tearing and swollen eyes; sometimes associated with itchy nose and sneezing. Allergy season is here. Ocular allergies are caused chiefly by pollen or animal dander that travel into the tear film. Seasonal and pet allergies can also affect the eyes. Seasonal conjunctivitis is caused by different allergens, depending on the month of year and geographic location. April-May allergies are usually caused by trees, June and July by grasses and August –September allergies by ragweed.