Systane Eye Drops is a sterile solution containing polyethylene glycol 400, propylene glycol, hydroxypropyl guar, boric acid, calcium chloride, magnesium chloride, potassium chloride, sodium chloride, zinc chloride, and polyquad® (polidronium chloride) 0.001%. Systane® Lubricating Eye Drops is a comfort solution that moisturises the surface of your eyes for fast, long-lasting relief of the feelings of dryness, irritation, burning, stinging, grittiness or foreign body sensation caused by environmental factors, such as dust, smoke, ozone, UV light rays, dry heat (radiator / sauna), air conditioning, wind, drafts, cosmetics, or a reduced blink frequency due to prolonged television watching or concentrated computer screen work.