Most people understand that spectacles are the product of a variety of disciplines. Probably number one in people's minds is the medical discipline, the work of the ophthalmologist and optometrist who are trained in the medical aspects of vision and glasses. But there is also the element of optics, the theory of light and the science of physics. The diagnosis of visual defects and the correction of vision with glasses could not take place without understanding how lenses focus light inside the eye, the science of optics. In addition, there are engineering or mechanical aspects to glasses. The optician (or fitter) works with these elements. These mechanical features of glasses involve primarily the frame and the fitting of the spectacles. The positioning and holding of the lenses in the proper position on the face is an important part of glasses. When monocles and pincenez were the fashion the mechanics of frames and fitting or lack thereof was simple. Today, with the advent of bifocals, progressive lenses and aspherical and atoric surfaces, the mechanics of frames and fitting have become engineering and science. Panascopic angle, bridge type with nose pads that fit, temples that hold and fit them, are all examples of mechanics in glasses.
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