mary diaz
bogota
The glasses, also known as glass, lenses, glasses or eyeglasses; they are an optical instrument consisting of a pair of sunglasses attached to a frame, which rests on the nose by a bow and two pins that help sustain them in their ears.are made of two products, lens and mount.
Materials
1. Lenses: lenses of the glasses were made of glass, however, today other materials lighter and more resistant, such as organic polymers and polycarbonate are used.
2 Frame or mount: originally the frames or frames were manufactured in iron or steel, later began to use resins to reduce the weight of the frameworks, however these were too rigid and tended to break upon impact and low torque.
♥ kinds of sunglasses:
-Bifocal glasses : are corrective lenses.They are mostly used for people who have damaged vision, bifocal lenses are available with the segment for reading in a variety of shapes and widths.With the widespread use of computers, users of bifocals have experienced some problems.
-Sunglasses: sunglasses are sunglasses often colored or darkened to protect the eyes of light direct and annoying.Sunglasses frames are usually made with a synthetic material, such as plastic or metal. Lenses tend to have different levels of blocking ultraviolet (UV) rays.
♥ who invented goggles?:
The invention of sunglasses is attributed to an Italian Friar called Alessandro della Spina, around the eighth century. Thanks to his invention, the artisans and monks could continue working even when they began to have vision problems. Obviously, it is a round invention, and not only by its form. So, Venice enjoyed years of control of the lenses, and his Guild of glassmakers won an important benefit of this.