It's important to wear sunglasses anytime you're outside or in a vehicle during the day, as they can protect your eyes from the UV rays. Even if it doesn't seem very sunny, you are still helping preserve your vision with sunglasses.
Keeping your sunglasses clean with help them - and you - look great and perform well. However, premium sunglasses and especially their lenses require careful treatment. Improper care can damage lenses, resulting in scratches or haziness, which in turn may cause eyestrain. So, the best way to clean your sunglasses is by gently rubbing them with a lens cleaning cloth and a liquid cleaner specifically designed for eye wear lenses, or with a moistened towelette
Photo chromic lenses: They darken to protect exposure to UV light and lighten when it is dark outside Gradient lenses: These are designed for people with high sensitivity and need protection from UV rays while still seeing other objects clearly Mirrored glass: These control the amount of light entering the eyes Polarized lenses: They are beneficial for outdoor activities, such as fishing and swimming
Two years is the average time to use most sunglasses, mainly if you wear them daily. However, going to an eye doctor will let you know how long you should wear your sunglasses before they need to be updated.
Ultraviolet rays travel with a wavelength of 10 to 400nm. UVA has a wavelength of 320 to 400nm and causes sunburning, UVB travels in the range of 280 to 320nm, causes sunburn and kills bacteria. UVC is from 100 to 280nm and is usually filtered out by the ozone layer.