“May all be happy, may all be healed, may all be at peace and may no one ever suffer."
Zinc ions, the active compound of zinc sulphate, have an astringent, i.e. tissue-sealing and slightly anti-septic effect. Naphazoline constricts the blood vessels and reduces the inflammation and swelling of the conjunctiva. This effect of naphazoline, a substance of the benzylimidazoline group, is due to direct binding to a-adrenergic receptor sites on unstriated muscle cells in the blood vessels.