It’s great to have a snazzy pair of sunglasses that make you look good, as long as they also protect your eyes from harmful ultraviolet-rays. Don’t take your eyesight lightly,ultraviolet rays can be very damaging.
Sunglasses were originally invented for use by Navy pilots for flying at high altitudes. They came in one style and color. Today, sunglasses come in hundreds of styles and colors but their main purpose is the same – protection from damaging sunlight to the eyes.
The best sunglasses provide 100 percent protection from ultraviolet-rays hitting the cornea. Early sunglasses used glass lenses. The glass was ground with an optical grinder and treated to prevent viewing distortion.
When lenses cause viewing distortion, the wearer can get headaches and feel dizzy. When looking for the best sunglasses, look for those that use optically ground glass. It will ensure clear vision.
You’ll find that glass has a natural resistance to ultraviolet rays, and will provide the best protection for your eyes. Without sunglasses your eyes are defenseless against harmful ultraviolet rays.
The color of the sunglasses also serves a function. Dark sunglasses that allow only about 15 percent of natural light through are the best for protecting the eyes from ultraviolet rays. They are especially helpful if you have pale or sensitive eyes.
In their research, scientists learned that pilots flying at high altitudes had fewer problems with glare when they were wearing sunglasses that blocked out 85 percent of bright sunlight. Keep that in mind when selecting a pair for yourself.
Choosing a good pair of sunglasses may seem like a simple decision but there is more to consider than looks alone. The best sunglasses are optically ground to provide protection against ultraviolet rays and only allow 15 percent of sunlight to penetrate.
If you are suffering from knew pain, the knee ice pack and reusable heat packs are useful to alleviate the pain.