Nasal and eye allergies, also known as allergic rhinitis and conjunctivitis, can cause a lot of suffering, and impact between 10 to 30% of the population worldwide. These conditions are caused by swelling and inflammation of the tissues of the nose and the surface of the eyes, triggered by external environmental allergen proteins, such as pollen, mold, dust mites, and animal dander. Seasonal allergic rhinitis, also known as hay fever, is triggered by fluctuations in allergen exposure during different times of the year. This most often occurs in the spring, summer and fall months. Some people can also suffer from year round nasal and eye allergies, often triggered by indoor allergens or a combination of indoor and outdoor allergens.