The Original Clinically-Proven Formula Naphcon A! Naphcon A is one of Alcon s oldest and most trusted formulas for red eye and itch relief. It s clinically proven to relieve itching & redness due to eye allergies. How to Use Naphcon A Eye Drops Naphcon A is just as easy to use as other lubricant eye drops! Just tilt your head back hold open the affected eye and put in 1 or 2 drops up to 4 times daily. Remember to always remove contact lenses and wash your hands before applying Naphcon A. Check the expiration date before use and do not use if the solution changes color or becomes cloudy. Ask a doctor before use by children under 6 years.