Perhaps the most important elements of effective sunglasses are the optical quality and visual enhancement properties of the lenses. Many lens tints such as brown, green, grey, yellow and orange are now available, with each colour suitable for specific circumstances. Skiers in snow would want the high contrast provided by amber lenses, whereas grey lenses are best for preserving “real world” colours in bright sunlight. Polarised lenses are highly in demand because they reduce glare from light reflecting off flat surfaces, such as water or a field of snow, making them ideal for sports such as fishing, cycling, hunting and most water or snow related activities.