"Hya-Opthal sine relieves the unpleasant symptoms of your dry eyes, such as dryness or a feeling of sand or burning in the eyes, provides long-lasting relief, noticeably refreshes your eyes and is suitable for rewetting all contact lenses, can be used daily without restriction and is free from preservatives, is very well tolerated, as hyaluronic acid is also a natural component of the tear film." (Manufacturer's advertisement)