These drops contain powerful ingredients to stimulate tear film production, counteract irritation, halt allergies and reduce foreign body sensation. Homeopathic Calendula is known to support corneal health and is indicated for corneal abrasions and erosions. The clarifying “Thin Eye Drop” is preservative free and used as often as needed to alleviate dry, red, itchy, irritated eyes. All Natural Ophthalmalics Rx products are safe for use with contact lenses of all types. There are no known side effects or drug interactions. Safe for pregnant women and children. Preservative free.