Sterile. Helps remove and prevent protein buildup to clean lenses while you wear them. Helps clean lenses while you wear them. Over the course of the day, a film of protein and other material can build up on your contact lenses, irritating your eyes and clouding your vision. This is especially true with today's extended wear lenses. Complete Blink-N-Clean Lens drops do more than just rewet lenses. A few drops of the exclusive dual-cleansing formula gently dissolves away debris and material that can cause irritation and discomfort. It helps remove protein build-up to ensure that your lenses stay as fresh as they can be and your vision remains clear. Just a few drops of Complete Blink-N-Clean lens drops, actually helps remove and prevent protein buildup, eliminating the need to stop and remove your lenses to clean them. Complete Blink-N-Clean Lens Drops are doctor recommended for use with all types of soft contact lenses. This preparation contains no chlorhexidine, no thimerosal and no other mercury containing ingredients.