A
Allergen
Any substance that triggers an exaggerated immune response in an individual.
Allergic Conjunctivitis
The most common type of eye allergy, characterized by redness, itching and watering. It may either be seasonal (due to pollen) or perennial (due to year-round allergens such as mold or pet dander).
Allergic Rhinitis
Also known as hay fever, this allergic reaction occurs when allergens touch the lining of the nose of a susceptible person. Symptoms include nasal itching and dripping, congestion and itchy, watery eyes.
Antihistamine
A chemical compound in many allergy medications that blocks the action of the body's histamine secretion, thereby alleviating symptoms.
C
Conjunctiva
The white of the eye, which becomes inflamed when triggered by an allergen.
D
Dust Mites
Microscopic arachnids that thrive on the tiny plant and animal particles that form dust. Mite droppings are the most common allergens for asthma and perennial allergies.
E
Eosinophil Cells
Specialized cells on the eye's surface that rupture and release histamine and other chemical mediators in response to an allergen.
H
HEPA
(High efficiency particulate) A specialized filter or system that can be used to capture and remove molds, dander and other allergens from indoor areas.
Histamine
A chemical released by the body's mast cells when allergens are present. Histamine causes redness, itching, swelling and other allergy symptoms.
I
Immunotherapy
A series of allergy shots or vaccinations over an extended period of time to desensitize a person to a particular allergen.
K
Ketotifen Fumarate Ophthalmic Solution
The generic name for ZADITOR.
M
Mast Cell
A specialized cell that produces histamine and other chemicals when allergens are present. Mast cells are present throughout the body, but are highly concentrated in the eyes.
Mediators
Histamine and other chemicals, which are secreted by mast cells and produce allergic symptoms such as itching and swelling.
Molds
Microscopic fungi that produce airborne spores that act as allergens for many people. Molds live both indoor and outdoors and are present all year in warm, moist climates.
N
Non-steroidal anti-inflammatory agents (NSAIDs)
Nonprescription drugs such as aspirin and ibuprofen that can reduce inflammation and swelling.
O
Ocular allergy
An allergic reaction that occurs in the eye. The most common type is seasonal allergic conjunctivitis.
P
Pet dander
Dead skin flakes constantly shed by furry animals. A protein in an animal's dander, saliva and urine is a powerful allergen for susceptible people.
Pollen
Powdery microscopic granules that contain the male cells from flowering trees and plants. They are necessary for plant fertilization and are the main cause of seasonal allergic conjunctivitis.
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