What is Per una used for? It provides prolonged lubrication of the eyes in case of dryness, burning, and eye strain, as well as other minor non-pathological disturbances caused, for example, by dust, smoke, heat secco, air conditioning, prolonged use of computer video, use of contact lenses, or ophthalmological examination.| Composition: 1 ml of solution contains Sodium Hyaluronate 3.0 mg, Sodium Chloride, Potassium Chloride, Disodium Phosphate, Sodium Citrate, Magnesium Chloride, Calcium Chloride, Distilled Water for injectable preparations.