Clear Vision for a Better Outdoor Experience. The McNett Op Drops Anti-Fog and Lens Cleaning System is a gentle, alcohol-free cleaner designed to keep all of your lenses, optics and eyewear free of frustrating fog. Squeeze the Op Drops lens cleaning formula on binoculars, sunglasses, spotting scopes, helmet visors, goggles and eye shields. Then wipe with the attached microfiber cleaning cloth (which doubles as a carrying pouch) for lint-free cleaning power. Your lenses will be clean, clear and protected against fogging.