Prevention of allergic conjunctivitis.Prevention or therapeutic agent for allergic conjunctivitis that uses omega-3 fatty acid or its ester as an active ingredient.No selection【課題】新たなアレルギー性結膜炎の予防治療剤の提供。【解決手段】オメガ3脂肪酸又はそのエステルを有効成分とするアレルギー性結膜炎予防又は治療剤。【選択図】なし