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2. Abbe number - Wikipedia

   en.wikipedia.org/wiki/Abbe_number

   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 ...

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   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.

4. The pros and cons of Medicare Advantage: Should you ... - AOL

   www.aol.com/finance/medicare-advantage-pros-cons...

   The benefits of Medicare Advantage: How it's different Medicare Advantage — or Part C — is an alternative to Medicare parts A and B. These plans are offered by private insurers that contract ...

5. Condenser (optics) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(optics)

   Condenser (optics) A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam to illuminate an object to be imaged. Condensers are an essential part of any imaging device, such as microscopes, enlargers, slide projectors, and telescopes. The concept is applicable to all kinds ...

6. 7 Ways to Score Free Dental for Seniors on Medicare - AOL

   www.aol.com/7-ways-score-free-dental-120023012.html

   7 Places to Get Cheap or Free Dental Care for Seniors. Medicare beneficiaries who use dental ... The average annual limit on dental benefits among Medicare Advantage plans that offer more ...

7. Who is eligible for Medicare? Experts explain the rules ... - AOL

   www.aol.com/finance/eligible-medicare-experts...

   When to apply for Medicare Part C (Medicare Advantage) As a Medicare beneficiary, you have the option to receive Medicare coverage through a participating private Medicare Advantage (MA) plan.

8. Chromatic aberration - Wikipedia

   en.wikipedia.org/wiki/Chromatic_aberration

   Chromatic aberration. Focal length of lens varies with the color of light. In optics, chromatic aberration ( CA ), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [ 1][ 2] It is caused by dispersion: the refractive index of the lens elements ...

9. Medicare Advantage Benefits Explained! - AOL

   www.aol.com/news/medicare-advantage-benefits...

   Over the past several months, you’ve probably been inundated with Medicare ads promising lots of free benefits. If you feel overwhelmed or confused, you’re not alone! “It’s important to ...