Optrex Intensive Eye Drops - 10ml For dry eyes Longer lasting relief* *Sodium hyaluronate (HA0.15 or 0.18%) showed a longer residence time on the ocular surface when compared to 0.3% hypromellose (HPMC). Dry eye syndrome can be caused by many aspects of modern living, from computer use to air conditioning. Optrex Intensive Eye Drops: Offer intensive dry eye symptom relief that lasts Instantly hydrate, lubricate and soothe dry eyes Effective and longer lasting relief than with common Hypromellose eye drops* Suitable for use with contact lenses