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2. Phoropter - Wikipedia

   en.wikipedia.org/wiki/Phoropter

   The lenses were increased to 3 ⁄ 4 inch diameter, the permanent size, and the unit was much more massive, with a weight of 7 lb. 9 oz., and with a range of +16.87 to -19.12 sphere and 6.00 cylinder, with auxiliary lenses to increase these to +18.87/-21.12 sphere and 8.00 cylinder. All these models resembled the original DeZeng model in design ...

3. 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.

4. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/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.

5. List of instruments used in ophthalmology - Wikipedia

   en.wikipedia.org/wiki/List_of_instruments_used...

   Jackson's cross cylinder: used to check the power and axis of a cylindrical lens: Maddox rod: used to test for latent squint and retinal function Refraction box: has lenses of different powers for refraction testing: Slit lamp bio microscope: used for examining the anteriorly placed structures the eye; video link: Charts for vision - •Distant ...

6. 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.

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 ...

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   mail.aol.com

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9. Pinhole occluder - Wikipedia

   en.wikipedia.org/wiki/Pinhole_occluder

   The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the eye's lens, defects in the shape of the lens (errors of refraction) have no effect while the occluder is used.