Optrex Contact Lens Eye Drops Optrex Contact Lens Eye Drops provide long lasting moisturisation for contact lens wearers to relieve the symptoms of dry eyes. They can be applied directly to the eyes without the need to remove lenses first so you can simply get on with your day. Optrex Contact Lens Eye Drops contain sodium hyaluronate which has been shown to stay on the surface of the eye longer than hypromellose 0.3% eye drops for long lasting comfort.