3. Allergic conjunctivitis
This type affects up to 20 percent of the population and when triggered by hay fever, flares up when irritants from trees and grasses are at their peak (between March and July), and during ragweed season (mid-August to the first frost). “The hallmark symptoms are eye itchiness, redness, a runny nose and sneezing,” says Dr. Moloney. He recommends having a doctor determine which type of conjunctivitis you have before treating it.