Level Of UV protection is important to consider before buying sunglasses because, sunglasses are protective eye wear that prevent damage to the eyes from high energy light or sunlight. Sunlight include the Ultraviolet light spectrum and these rays may cause eye problems if the eyes are exposed to excessive amounts of UV radiation over a period of time.
There are 3 types of Ultraviolet Rays namely; UVA, UVB, and UVC.
UVA- Ultraviolet A
Passes through glasses easily, and has a longer wavelength. Protective eyewear can prevent damage to the eyes from this class of ultraviolet rays.
Medium-wavelength UVB rays do not go through the glasses; they are the most dangerous among the three, so sunscreen and sunglasses are a must when one is going out or at the beach.
The most damaging type of UV radiation. The atmosphere of the earth blocks these Short-wavelength UVC from reaching the earth’s surface.
Points to Consider when Buying Sunglasses
To choose the right sunglasses, consider the following;
- It should be able to block UVB, UVA at 99 to 100%.
- For proper color recognition, consider lenses that are gray in color.
- Always consider the amount of visible light. Proper sunglasses should screen out 75 to 90%.
- Lenses should be free from imperfection and distortions.
- Lenses should have a uniform tint.
- Most polarized lenses offer protection to your eyes.
- Remember, the ability to block UV rays is not determined by the degree of darkness or the color of your sunglasses but the quality.
- Optician or manufacturer can help in assessing and measuring the protection of sunglasses from UV rays.
- Ensures the lenses fit close enough to the face, but not too close to eyelashes to reduce any chances of stray light from reaching the eyes from any side.
UV rays can cause long and short-term problems to the eyes such as pterygium, cataracts, photokeratitis, various eye cancer and snow blindness.
Always ensure that before purchasing your sunglasses, to check the label that it is UV 400 capable, so your eyes are protected from UVA and UVB rays.