So far I was thinking that
sunglasses are a fashion statement that should only be worn by Hollywood or Bollywood stars. They wear such
big glasses, give a nice big smile, wave at the crowd and disappear in thin
air. But the husband told me such a scary story about a colleague, who nearly
lost his sight because of not wearing sun glasses. This made me do a little
study about sunglasses. Here are the details.
Sunglasses or sun cheaters
protect your eyes from bright sunlight and high energy visible light. Do you
know that even prehistoric people wore sun glasses? The Inuit people wore
flattened walrus ivory glasses. When exposed to sunlight the eyes suffer badly.
It may cause sunburn of the
eye which can lead to loss of vision for 48 hours. Surfer’s eye is a condition which
causes benign growth on eye surface which can itch, swell or become irritable.
The consequences of not
wearing sunglasses can also lead to cataracts, age related macular degeneration
and cancer of eye and eyelid.
Sun glasses improve the
comfort of vision and increases clarity by reducing the amount of glare. Now,
you have to protect the eyes from UVA and UVB radiation. Harvard scientists
recommend some really useful glasses. The cosmetic variety has light colored
tints and blocks about 70% of UVB rays 20% of UVA and 60% of visible light.
The UVA rays are responsible for
skin tanning and ageing of skin. The UVB rays causes sun burn and skin cancer. The
sun glasses used for general purpose has medium to dark lenses it blocks 95% of
UVB rays and 60% of UVA and 60-90% of visible light. The special purpose
sunglasses has extremely dark lenses and blocks 99% of UVB rays 60% of UVA rays
and 97% of visible light.
I hope the scientists have
done a great job by advising on the type of glasses to wear. Hope you are on
your way to the market to buy yourself a nice pair of sunglasses. And be
careful not to disappear in thin air.