Optrex allergy drops help to relieve and prevent the redness watering and itching that39s misery for anyone suffering from hayfever asthma or an allergy to housemites pet hairs etc it helps to protect your eyes by blocking the release of histamines to prevent the allergic reaction taking place take optrex allergy drops as directed before and throughout the high pollen season to help avoid hayfever symptoms like itching watery eyes