Clinitas Preservative Free eye drops are ideal for people having active lifestyle that often results in sub-chronic dry and gritty eyes caused by: Low-blink rate activities due to computer use, TV watching, driving and reading Lachrymal insufficiency Sensitivity to preservatives When applied as eye drops it forms a transparent film that coats the surface of the eyeball. The film is able to \'hold on\' to water molecules in the tears, which helps keep the eyeball moist, and remains stable when you blink, thus providing lasting lubrication for the eyes. The drops are used as artificial tears to moisten, lubricate and soothe dry eyes.