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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 ...
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.
An optical instrument is said to be diffraction-limited if it has reached this limit of resolution performance. Other factors may affect an optical system's performance, such as lens imperfections or aberrations, but these are caused by errors in the manufacture or calculation of a lens, whereas the diffraction limit is the maximum resolution ...
Straumann Group is a Swiss company based in Basel (Switzerland) manufacturing dental implants and specialized in related technologies. The group researches, develops, manufactures and supplies dental implants, instruments, biomaterials, CADCAM prosthetics, digital equipment, software, and clear aligners for applications in replacement, restorative, orthodontic and preventative dentistry.
Abbe condensers are difficult to use for magnifications of above 400X, as the aplanatic cone is only representative of a numerical aperture (NA) of 0.6. This condenser is composed of two lenses, a plano-convex lens somewhat larger than a hemisphere and a large bi-convex lens serving as a collecting lens to the first.
This list of dental schools in the U.S. includes major academic institutions in the U.S. that award advanced professional degrees of either D.D.S. or D.M.D. in the field of dentistry. It does not include schools of medicine, and it includes 72 schools of dentistry in 36 states, the District of Columbia, and Puerto Rico. These dental schools are ...
May 9, 2024 at 12:09 PM. Dental Group of Amarillo (DGA) sent out an alert Thursday that it is notifying patients who may have been impacted by an incident involving some of their personal ...
Refractive index. In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or refracted, when entering a material. This is described by Snell's law of refraction ...
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5609 Trabue Road, Columbus, OH · Directions · (877) 684-3573