To review the most recent research on the prevalence of allergic conjunctivitis alone or in conjunction with allergic rhinitis, as well as the clinical and demographic features of the condition was the purpose of the study. In 30–71 percent of allergic rhinitis patients, allergic conjunctivitis or conjunctival symptoms are present. Allergic conjunctivitis is estimated to affect 6–30% of the general population, and up to 30% of children, either alone or in conjunction with allergic rhinitis. The most common form is seasonal allergic conjunctivitis; however, research from tertiary ophthalmology referral centers shows that chronic forms, such as vernal and atopic keratoconjunctivitis, are the most commonly encountered by ophthalmologists. A recent big nationwide survey including 304 ophthalmologists revealed that the majority of individuals with allergic conjunctivitis experience a few bouts of mild, intermittent conjunctivitis per year. However, 30% of individuals experience frequent periods of severe and lasting symptoms. Treatment is usually ineffective.

Despite the fact that allergic conjunctivitis is commonly linked with allergic rhinitis, epidemiological studies frequently fail to incorporate detailed ophthalmological assessments. Understanding allergic conjunctivitis illness, its incidence, demography, and treatment paradigms would help to understand its pharmacoeconomics and impact on national health systems.

Reference:https://journals.lww.com/coallergy/Abstract/2015/10000/Epidemiology_of_allergic_conjunctivitis__clinical.14.aspx