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Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
Dental Health Maintenance Organization plans entail dentists contracting with a dental insurance company that dentists agree to accept an insurance fee schedule and give their customers a reduced cost for services as an In-Network Provider. Many DHMO insurance plans have little or no waiting periods and no annual maximum benefit limitations ...
For a doublet consisting of two thin lenses in contact, the Abbe number of the lens materials is used to calculate the correct focal length of the lenses to ensure correction of chromatic aberration. If the focal lengths of the two lenses for light at the yellow Fraunhofer D-line (589.2 nm) are f 1 and f 2 , then best correction occurs for the ...
Roadside Assistance. Roadside assistance on auto policies is an additional $10-$30 each month for a service you can get for a one-time $50-$100 fee, in the experience of Vonda Copeland, owner of ...
The cost of the surgery can be significant. According to ASPS, the average cost of a surgeon’s fee for cosmetic breast reduction is $6,771. Additional fees may include anesthesia and hospital or ...
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