The art of vision......experience the extra time and care we take
The ozone layer is being damaged by various man-made chemicals (e.g. chloro-fluorocarbons, or CFCs), and evidence shows that UV levels have increased in Europe and other non-polar regions. It is not yet known how much exposure to UV radiation will cause how much damage, but a good recommendation is to wear quality sunglasses that offer good protection and a wide-brimmed hat when outside.
To ensure adequate protection for your eyes, your sunglasses should:
• always have UV certification as shown by the CE mark
• block out 99 to 100 percent of both UV-A and UV-B radiation
• screen out 75 to 90 percent of visible light
• be perfectly matched in colour and free of distortion and imperfection
• meet the British Standard for sunglasses
(BS EN 1836:2005): category 2 (20% transmittance).
Should I choose Polarised lenses?
Light reflected from surfaces such as a flat road or smooth water is generally horizontally polarized creating an annoying and sometimes dangerous intensity of light that we experience as glare. Conventional sunglasses may block out the glare, but they also block out subtle details, which can be dangerous. Polarized lenses filter out the intense reflected light, reducing glare, whilst retaining critical vision and allowing you to see clearly in comfort.
There are a few occasions where conventional sunglasses have an advantage; for example spotting the glare of icy patches on a ski-slope. In addition, polarized lenses may make it difficult to see liquid crystal displays (LCDs) found on the dashboards of some cars or in other places such as the digital screens on ATM bank machines.
For most other sports and activities, polarized sunglasses offer great advantages. And today, many polarized lenses are available in combination with other features such as photochromic lenses or Varifocal lenses.
Sunglasses for children?
Eye protection is especially important for young children whose eyes are more vulnerable to UV light damage.
Parents tend to buy cheaper sunglasses for their children as the glasses are often lost or broken. This can be counterproductive, as poor-quality sunglasses do not protect effectively against the sun's damaging UV rays.
Sunglasses and UV protection
- who needs it?