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2. Lensmeter - Wikipedia

   en.wikipedia.org/wiki/Lensmeter

   The parameters appraised by a lensmeter are the values specified by an ophthalmologist or optometrist on the patient's prescription: sphere, cylinder, axis, add, and in some cases, prism. The lensmeter is also used to check the accuracy of progressive lenses , and is often capable of marking the lens center and various other measurements ...

3. Cylindrical lens - Wikipedia

   en.wikipedia.org/wiki/Cylindrical_lens

   Cylindrical lenses. A cylindrical lens is a lens which focuses light into a line instead of a point as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to intersection of the surface of the lens and a plane tangent to it along the cylinder's axis.

4. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   A phoropter measurement of a patient reads −8.00 D sphere and −5.25 D cylinder with an axis of 85° for one eye (the notation for which is typically written as −8 −5.25×85). The phoropter measurement is made at a common vertex distance of 12 mm from the eye.

5. Subjective refraction - Wikipedia

   en.wikipedia.org/wiki/Subjective_refraction

   The cylinder power is refined by superimposing the 0.50JCC over the correcting cylinder axis in the trial frames. The patient is asked to indicate whether it is clearer with or without the lens. Dioptric changes are then made in 0.25 increments in order refine cylindrical correction.

6. Astigmatism (optical systems) - Wikipedia

   en.wikipedia.org/wiki/Astigmatism_(optical_systems)

   Astigmatism causes difficulties in seeing fine detail. Astigmatism can be often corrected by glasses with a lens that has different radii of curvature in different planes (a cylindrical lens), contact lenses, or refractive surgery. [5] Astigmatism is quite common. Studies have shown that about one in three people suffers from it.

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

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

   You should also measure your current frames to make sure the new ones are a similar size. Pair offers only about 10 frame styles each for men and women, with five available for kids. But you can ...

8. Autorefractor - Wikipedia

   en.wikipedia.org/wiki/Autorefractor

   By measuring this zone, the autorefractor can determine when a patient's eye properly focuses an image. The instrument changes its magnification until the image comes into focus. The process is repeated in at least three meridians of the eye and the autorefractor calculates the refraction of the eye, sphere, cylinder and axis.

9. AOL Mail

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