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2. Corrective Optics Space Telescope Axial Replacement

   en.wikipedia.org/wiki/Corrective_Optics_Space...

   The Corrective Optics Space Telescope Axial Replacement ( COSTAR) is an optical correction instrument designed and built by NASA. It was created to correct the spherical aberration of the Hubble Space Telescope ' s primary mirror, which incorrectly focused light upon the Faint Object Camera (FOC), Faint Object Spectrograph (FOS), and Goddard ...

3. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

4. Maddox rod - Wikipedia

   en.wikipedia.org/wiki/Maddox_rod

   The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens, which refracts light rays so that a point source of light is seen as a line or streak of light. Due to the optical properties, the streak of light is seen perpendicular to the axis of the cylinder. Maddox rod and pen torch used in Maddox rod testing

5. Gradient-index optics - Wikipedia

   en.wikipedia.org/wiki/Gradient-index_optics

   Gradient-index optics. A gradient-index lens with a parabolic variation of refractive index ( n) with radial distance ( x ). The lens focuses light in the same way as a conventional lens. Gradient-index ( GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material.

6. I tried those Pair Eyewear glasses with the magnetic ... - AOL

   www.aol.com/lifestyle/tried-those-pair-eyewear...

   With prices starting at $60 per frame, prescription lenses included, Pair is already pretty affordable. However, for a limited time, Yahoo Life readers can save 15 percent on any Pair Eyewear ...

7. This Simple Trick Helped Me Avoid Hip Replacement - AOL

   www.aol.com/lifestyle/simple-trick-helped-avoid...

   Get super helpful articles like this for free with the award-winning best-in-class AGEIST weekly magazine here. In 2012, I hired a triathlon coach and set a goal to beat my Olympic-distance ...