Spectacle corrected visual acuity, or eye protection is based on the production of a simple optics. Composed by the lens and frame. Vision correction with glasses and a short-sighted glasses and hyperopia glasses, reading glasses, as well as four kinds of astigmatism glasses. Use of eye protection glasses have bons degree basto goggles, wind mirrors and cents Diluo La cindylaura sunglasses and so on.
Glasses protect your eyes is a tool, but also a kind of beauty accessories. From the lens function of sense, it can regulate the amount of light entering the eye to increase the visual acuity, eye protection safety and clinical treatment of eye effect on the refractive error caused by children accompanied by strabismus and refractive abnormalities in patients with headache, the wearing of glasses can be treated later. The function of spectacle frames, in addition to its complete composition glasses for lenses worn on the eye play a role in bracket, it also has beauty, decorative. Modern pop stressed the need glasses with the times people face makeup and fashion accessories harmony superb response to social class, learning elegance, fashion, and so symbolic.
With the rapid development of social technology, with the people's culture, and the continuous improvement of living standards, vision care work, glasses in people's lives that will be to play an important role in the field。
Because the 13th century intermediate stage, British scholar Bacon saw to many people the vision is not good, could not see clearly in the book writing, wanted to invent one kind of tool to help the people to enhance the vision. Therefore, he had thought many means that have performed many experiments, but has not succeeded. after one day of rain, Bacon arrived at the garden to take a walk, sees in the spider web to moisten many raindrops, he discovered that looked at the leaf by the raindrop, the leaf vein enlarged many, careful Mao Duneng could see including the leaf on. He sees this phenomenon, happy extremely. Bacon runs back in immediately the family, rummaged through chests and cupboards, has found a bulb. But penetrates the bulb, reads on writing, is slurred. He looks for together the diamond and the hammer, shears at the same place the glass, as soon as takes this sheet glass to approach the book to look, the writing really enlarged. Experimented has been successful, Bacon was wild with joy. Afterward he looked for a wood chip, dug out a round hole, installed the bulb piece, installed a handle again, was advantageous for the hand to take, such people read write facilitate are many. this kind of lens afterward passed through improve unceasingly, have become the eyeglasses which the present people wear. The presbyopic glasses which the light corrects defects of vision has the young people to use the eyeglasses for myopia which and the senior citizen wears, but also has other each use eyeglasses, the people studied, the work to be more convenient. Bacon has made the contribution for humanity's civilized progress.
