Contributed by: verygood101 @ yahoo.com
Proper sunglasses are most important during summer because it protects your eye from the harmful UV-rays that are the cause of blindness, cataracts etc.
# Always look for sunglasses that block 99 or 100 percent of UV radiation thereby protecting your eyes.
# Also see to it that the lenses are dark enough to filter out 75 to 90 percent of the powerful sunrays that makes you squint.
# The lenses should not cause eyestrain, headache, and, give ugly wrinkles.
# One way to ensure that the sunglasses will protect your eyes from harmful rays is to always put on your sunglasses and take a look in the mirror; if you can see your eyes, the lenses aren`t dark enough to screen out visible light.
# Use colours of your lenses that will help you see the world`s true colour, like grey, brown, or green. Avoid yellow or amber lenses they make it hard to distinguish the traffic signal.
# If you are buying plastic lenses then pick one that has a scratch-resistant coating.
# Try to go for wraparound frames since they offer the most protection by blocking light from the sides, top, and bottom.
# Go for frames that are strong, sturdy as well as light. Nylon or composite frames are light and strong; metal frames tend to be fashionable but are often heavy.
Types of Sunglasses
# Single-gradient lenses: these are permanently shaded from top to bottom, cut glare from above but allow you to see clearly below.
# Double-gradient lenses are those, which are dark on the top and bottom and lighter in the middle.
# Polarized lenses are also great for all these activities, since they block light reflected off smooth surfaces like water and pavement.
# Photo chromic lenses, since they darken in bright light in about 30 seconds but take about five minutes to lighten up again in dimmer conditions.
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