Ever looked at a lake with the sun shining on it? Did you notice the glare coming off the water? Well, that's what happens to binoculars that don't have coated lenses. Anti-reflection coatings reduce light loss and glare due to reflection of light at air-to-glass surfaces. Besides increasing the light transmission, coatings also provide sharper and higher contrast images and aid in detailed identification of low contrast subjects in limited available light. Multilayer anti-reflection coatings (multi-coatings) provide a significant increase in light transmission over single layer coatings and are used in all high quality optical systems.