Ultraviolet light or UV light is a form of electromagnetic radiation that is invisible to the eye. It is invisible to us because its wavelengths are shorter than those of visible light.
UV light make up less than 10% of the sun’s total light output and only a fraction of this 10% actually penetrates the earth’s surface. However small your exposure to UV light, it still affect the cells which make up your body, through the chemical process of ionization. This process causes electrons and atoms to react with each other in ways they generally would not, for example:
UV-A - Penetrate the deeper skin layers where the connective tissue and blood vessels are affected. The lens of the eye absorbs most of the UVA rays to protect the retina, however continuous absorption results in connective tissue breakdown and degenerative changes within the lens, thus eventually affecting the retina as well.
UV-B - Cause more damage to the functionality of the eye because they reflect of any surfaces especially roads, water and snow, this increases the likelihood of cell damage. The cornea protects the eye against UVB but the conjunctiva (the mucous membrane that covers the front of the eye and lines the inside of the eyelids) stays exposed.
UV-C - These are the most threatening form of UV light as they contain the highest energy levels but luckily they are completely absorbed by the ozone layer and do not present any threat to our vision or skin at this stage.
1. Be mindful of the amount of exposure you have to UV light. Avoid tanning beds or UV producing equipment.
2. When you do spend time outdoors be sure to use protective items like:
Wear a wide brim hat or large peak caps which can reduce your UV exposure up to 50%;
We all know this one, wear sunscreen;
Invest in UV protective eyewear. When choosing your eyewear there are a few things to consider:
3. Prevention is always better than cure, so we recommend visiting an eye doctor regularly to check for UV related visual issues.
Check out our infographic on protecting your vision this silly season.
Vision Works Optometrist’s perform comprehensive eye tests to check for signs of UV-induced visual conditions. Most conditions can be treated, or prevented from becoming serious with early detection.
By Tash Casey