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CR-39 is about half the weight of glass with an index of refraction only slightly lower than that of crown glass, and its high Abbe number yields low chromatic aberration, altogether making it an advantageous material for eyeglasses and sunglasses. A wide range of colors can be achieved by dyeing of the surface or the bulk of the material.
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Scratch-resistant coatings are added to glasses due to scratches' extreme ability to impact a wearer's vision. Even when optical glasses are made of high scratch-resistances glass, polycarbonate, or CR-39, coatings are still used. Optical coatings include diamond-like carbon (DLC) and anti-reflective-scratch hybrid coatings. Diamond-like Carbon ...
A much better way to disappear dirt, oil, smears and specks of lint is the megapopular Koala Eyeglass Lens Cleaner kit. This Amazon bestseller includes a bottle of alcohol-free cleaner and a ...
Uncoated glasses lens (top) versus lens with anti-reflective coating. The reflection from the coated lens is tinted because the coating works better at some wavelengths than others. An antireflective , antiglare or anti-reflection ( AR ) coating is a type of optical coating applied to the surface of lenses , other optical elements, and ...
The maximum color dosage depends heavily on the polymer used (particle size, surface finish and surface energy), the machine configurations and the pigment load of the liquid color. [1] This can cause problems with very thin-walled parts that must be colored as opaque as possible, or even prevent coloring with liquid color altogether.
In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.
An electronics repair kit including different resistors. Professionals who repair and maintain electronic equipment may have a kit containing a soldering iron, wire, and components such as transistors and resistors. In medicine, a repair kit consisting of a plug and plastic mesh may be used during inguinal hernia surgery. A particular trade may ...
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