An “allergy” may be defined as “an adverse immunological reaction to a substance that normally does not produce such a reaction.” Adverse reactions to things like pollen, mold spores and pet dander (called “allergens”), are allergies because most people are not bothered by them. An adverse reaction to cigarette smoke or bee stings is not technically an allergy because nearly everybody reacts to them.
The eye’s first line of defense against allergies and other irritants is the complex and extremely thin tear film that covers the eyes’ exposed surface. The tear film is 99% water. The remainder of the tear film consists of salt, proteins, antibodies, lipids, etc.
Factors such as air pollution, dry air, heat, wind, forced air heating and cooling and even stress can cause your tear film to lose water. If you happen to be sensitive to allergens such as pollen, the reaction will be more severe if your tear film is too dry and not functioning at full capacity. It is common knowledge among specialists that allergy eye (especially pollen allergies) is worse in hot, dry weather and better in cool, humid weather when it is easier to maintain the tear film’s natural moisture balance.
Standard eye drops may be ineffective against allergy eye because the large drops can wash away the natural tear film, including the evaporation-slowing lipid layer. Also, chemicals in these products can create their own adverse or allergic reactions.
© 2010 Bio-Logic Aqua Research