| They are designed to wrap slightly around the face, in a rounded shape, to avoid sharp corners that could jab your face and to block access of wind or dust into the eyes. The frame bands wrap around the ear, much like eyeglasses made for very small children, so that they won't fly off even if you are running at top speed in the middle of a dense forest. They are also rounded out at the tip with little balls that add counter weight against falling and make the band sit more comfortably on the ear crescent.The frame-bands that cross the temple are often designed with spring hinges that give the frame flexibility [as long as they are made with a material both durable and supple] without breaking when recoil occurs. The frames themselves are constructed of any number of ophthalmic materials, including titanium and other metals, regular plastic and tough polycarbonate and they normally have a "sweat bar" that runs the width of the frame above the lenses to add steadiness and keep it firmly fixed on the face. Different conditions require different equipment and protection. In-door shooting at a shooting ranges or organized matches all require protection and all outdoor activities have certain factors that must be considered- from rain, fog, direct sun, dust and the kind of weapon being used. Polarized lenses protect the eyes from sun-glare and they are tinted in color-enhancing tints to increase the contrast between each shade. |
