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August, 2011: The Eyes Have It!

 
            The sun is shining brightly upon us.  We’re out for a brisk summer walk in the morning.  We forgot a hat but we have sunglasses.  Definitely, we’ve brought the sunblock and have applied it liberally.   But we didn’t put the sun block on our face.  Nor did we buy these sunglasses checking on how well they block UV-A and UV-B (the worse kind) light.  And without the wide-brimmed hat we are still likely to be exposed too much.

            Yes, August is the month of fun in the sun.... but it is also Cataract Awareness Month.

Link to www.aao.org for what you can do about cataract prevention.  Here’s another link that tells you what to look for in good sunglasses:
http://www.tdi.state.tx.us/pubs/videoresource/fssunglasses.pdf
And these links give all the good reasons to help prevent both cataracts and worse damage (macular degeneration) to the eye (http://science.howstuffworks.com/innovation/everyday-innovations/sunglass1.htm   as well as  http://www.webrn-maculardegeneration.com/sunglasses-and-macular-degeneration.html ):
•           Sunglasses provide protection from ultraviolet rays in sunlight. Ultraviolet (UV) light damages the cornea and the retina. Good sunglasses can eliminate UV rays completely.
•           Sunglasses provide protection from intense light. When the eye receives too much light, it naturally closes the iris. Once it has closed the iris as far as it can, the next step is squinting. If there is still too much light, as there can be when sunlight is reflecting off of snow, the result is damage to the retina. Good sunglasses can block light entering the eyes by as much as 97 percent to avoid damage.
•           Sunglasses provide protection from glare. Certain surfaces, such as water, can reflect a great deal of light, and the bright spots can be distracting or can hide objects. Good sunglasses can completely eliminate this kind of glare using polarization (we'll discuss polarization later).
•           Sunglasses eliminate specific frequencies of light. Certain frequencies of light can blur vision, and others can enhance contrast. Choosing the right color for your sunglasses lets them work better in specific situations.

 

sunglassessquare_01sunglassestriangular_01

sunglassescatseyesunglassesround_01
Round face:
rectangular   
frames         
Oval face: square or cat’s
eye frames
Triangular, or heart-shaped face:
frames with a straight,
flat top, like aviator frames
(which have lenses that narrow
towards the bottom)
Square face:
rounder oval
cat-eye frames