The number one reason to wear sunglasses is to protect the eyes and the area around the eye from ultraviolet light from the sun.
Kinds of Ultraviolet (UV) Light
Ultraviolet (also known as UV light) comes in the three different types; Ultraviolet A (UVA), Ultraviolet B (UVB), Ultraviolet C (UVC). All three of these types of light come from our friend the sun. While all types of UV light are dangerous for our eye health, not all reach our eyes in the same way.
For instance most of the UVC is filtered out by the clouds and the atmosphere before it makes it from the sun to earth. Because of this UVC is not as essential to worry about over UVA and UVB, that you will certainly want protection from.
Sunglasses to Protect from UV
When the ultraviolet light hit our skin or hit our eyes, they can cause damage to the chemicals and protein that are in our body. You can see this once you are out of the sun and your skin starts to turn tan or burn from the ultraviolet light. This is the sun’s rays modifying components of your skin and if done too often can cause long term skin cancer and irreversible pigmentation problems.
Just like with your skin the ultraviolet light can damage eyes by causing cataracts, macular degeneration…
Thankfully most types of sunglasses offer a protection from both of UVA and UVB light waves coming from the sun.
Some Important Uses of Sunglasses
Sunglasses have many eye related advantages.
Most of the artificial lens we use now have UV protection built into the lens implant. This is helpful because with those lens implants that filter all UV light that passes into the eye, helps to lower macular degeneration by blocking the UV light before it gets back into the retina.
Another advantage of wearing sunglasses is that it improves glare, especially Polarised sunglasses which filter out some of the light that is coming into your eye and can obstruct with your vision. For example, especially fishermen and people under the water like to wear polarised sunglasses because it helps counter off some of the reflection coming from the water.
On top of all these things, sunglasses also improve contrast sensitivity, which means when you out in bright sunlight, a lot of colors is seen washed out too bright for your eye to handle, making you see color better.
Other Sources of UV Rays
Outside, the lights in our surrounding environments continue to change, and the light can vary according to the time of the day, weather condition and also the season. Visible and also invisible rays reflect off the surfaces around us and can come from every direction.
Whatever the intensity the sun emits visible light that enables us to see our environment and also invisible rays. Some of this rays can be dangerous UV rays and blue-violet light.
Luckily the pupil, our natural diaphragm, adjusts our eyes to the amount of light needed. So when the light intensity is low the pupil dilates and vice versa. When light is too bright the eye dazzle, then it is necessary to wear sunglasses that reduce the intensity of light and relief the pupil.