A sunglass or sunglass (informally called a shade or sunnies; more names below) protects the eyes from bright sunlight and high-energy visible light. Some are also used as visual aids with lenses that are coloured, polarized, or darkened. Sun cheaters were also called sunnies (cheaters were American slang terms for sunglasses).

A pair of sunglasses protects against excessive exposure to light, including its visible and invisible components.

The most widespread protection is against ultraviolet radiation, which can cause short- and long-term ocular problems such as photokeratitis (snow blindness), cataracts, pterygium, and various forms of eye cancer. To protect eyes against ultraviolet light, medical experts recommend sunglasses that reflect or filter out up to 99% or more of UVA and UVB light.  for adequate protection, experts recommend sunglasses with wavelengths up to 400 nm. These sunglasses are often labelled as "UV400". This is slightly more protection than the widely used standard of the European Union (see below), which requires 95% of radiation up to only 380 nm to be reflected or filtered out. Even during a solar eclipse, sunglasses aren't enough to protect the eyes from permanent damage from staring directly at the Sun. In order to view the sun directly, special eyewear called solar viewers must be worn. UV-blocking eyewear can protect the eyes from harmful UV radiation.

It is great to be able to block out the strong summer sun shining on your face. Having seriously considered being a vampire in a past life or being psychologically allergic to bright light, you need a sturdy pair of shades. Furthermore, a stylish pair of sunglasses can enhance your style quotient, especially if you believe "less is more" when it comes to accessorizing.

Choosing a pair of sunglasses that flatters your face isn't exactly child's play. Yes, we'd like to help! The following is a guide on how to pick the best sunglasses, which will enhance your style and look ultra-trendy.

It is generally a good idea to pick a sunglass shape opposite to the shape of your face when shopping for sunglasses. We must first determine your face shape before we can proceed.

Sunglasses can be quite an investment, so you want a pair that stays in style for years to come. You might want to pick a shape that is less experimental and likely to withstand fashion changes within the category of shapes that flatter your face outline. If you aren't building a collection, it's best to stick with classic shades.

The colour you pick should also be flattering for your face. Rectangular faces are typically advised to steer clear of bright, colourful frames, but that's general advice we'd give to most. Again, much like the shape, classic colours are your best bet. Blacks, muted browns, deeper reds and neutral shades like beige always look great. Tortoiseshell sunglasses look very classy if you don't want a solid colour. 

All said and done, if your sunglasses aren't protecting you from the harmful UV rays, it kind of defeats the purpose, doesn't it? So, check the extent to which the lenses you pick will protect your eyes, from ultraviolet light and the glare of the sun. Another important thing to remember is that polarized sunglasses feel great because they're mostly keeping the sun glare away, and not the UV rays. So go for something that gives you 100% UV protection.