Opticrom allergy 2 wv eye drops contains a medicine called sodium cromoglicate this belongs to a group of medicines called anti allergics it works by stopping the release of the natural substances in your eyes that can lead to an allergic reaction signs of an allergic reaction include itchy watery red or inflamed eyes and puffy eyelids opticrom allergy is used for the prevention and treatment of eye allergies these allergies can happen at any time of the year and is called perennial