The surface of your eye is covered by a thin layer of tears, called the Tear Film which protects, nourishes and lubricates the eye. Hycosan Shield replaces the outer layer of the tear film to form a shield and protect the tear film from evaporating. Hycosan Shield contains a single ingredient formulation (100% Perfluorohexyloctane)- a molecule that is first to market in eye drops in the UK. It is an easy to use eye drop with 6 months sterility and low surface tension for optimum spreading ability with minimum visual impairment. Hycosan Shield is water free, phosphate free and preservative free.