SAC (Seasonal allergic conjunctivitis) and PAC (Perennial allergic conjunctivitis) are the most common forms of ocular allergies. SAC is intermittent in nature, and, in temperate regions, follows exposure to pollen allergens in sensitized individuals. PAC is a mild, persistent form of allergic conjunctivitis resulting from continuing exposure throughout the year to persistent allergens.1
Eye irritation occurs when the eyes come into contact with an irritating agent causing the eye to water or redden.
The particles causing this inflammatory response may be a result of environmental factors such as pollution and wind, or external allergens such as dust mites and animal hair.2 Inflammation can be asymptomatic or generate symptoms like:3
- sensitivity to light
Ital J Pediatr 2013; 39: 18. https://doi.org/10.1186/1824-7288-39-18
2. Gomes PJ. Trends in prevalence and treatment of ocular allergy. Curr Opin Allergy Clin Immunol
2014; 14(5): 451-456.
3. Villani E, Rabbiolo G, Nucci P. Ocular allergy as a risk factor for dry eye in adults and children. Curr Opin Allergy
Clin Immunol 2018; 18(5): 398-403.