Purpose of Sunglasses:
- Protection from UV Rays: The primary purpose of sunglasses is to block harmful ultraviolet (UV) rays from the sun. Prolonged exposure to UV rays can cause various eye problems, such as cataracts, macular degeneration, and photokeratitis (sunburn of the eyes). Quality sunglasses block 99% to 100% of both UVA and UVB rays.
- Glare Reduction: Sunglasses help reduce glare, which is the bright reflection of light off surfaces like water, snow, or roads. This is particularly helpful for drivers, skiers, boaters, and outdoor enthusiasts. Polarized lenses are especially effective at cutting glare.
2. Types of Sunglasses
These are designed to reduce glare from reflective surfaces like water, snow, and roads. They're ideal for outdoor activities, especially around water.
These lenses automatically adjust their tint based on the surrounding light conditions. They darken when exposed to sunlight and become clear in low light.
These have a reflective coating on the outside, which reduces the amount of light entering the eyes. They're often worn for both aesthetic and functional purposes.
Offer true color perception and reduce brightness without distorting colors.
Improve contrast in low-light conditions but may cause some color distortion.
Enhance contrast and depth perception, making them suitable for activities like driving or fishing.
Mainly for fashion, these lenses are more about style than function.
Reduce glare while enhancing contrast and offering good color accuracy.