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2. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.

3. Joshua Silver - Wikipedia

   en.wikipedia.org/wiki/Joshua_Silver

   He applied this to create a new form of liquid-filled corrective lens, that could be easily adjusted by the wearer to correct the vision of over 90% of people requiring correction. [2] This is particularly useful for people in developing countries where specially trained optometrists are not available. [ 3 ]

4. Talk:Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Talk:Adjustable-focus...

   This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens. Some prescription forms use "ADD" in place of "N.V." with a single box to indicate the additional refractive power to be added to the spherical of each eye."

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

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

   I tried those Pair Eyewear glasses with the magnetic frames...and scored you an exclusive 15-percent-off code. Rick Broida. October 26, 2021 at 11:07 AM.

6. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   The power or focal length of adjustable or variable focus can be changed to suit the needs of the wearer. A typical application of such a lens is to refocus the correction allowing clear vision at any distance. Unlike with bifocals, near-vision correction is achieved over the entire field of view, in any direction. Switching between distance ...

7. Astigmatism (optical systems) - Wikipedia

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

   Although a person may not notice mild astigmatism, higher amounts of astigmatism may cause blurry vision, squinting, asthenopia, fatigue, or headaches. [ 10 ] [ 11 ] [ 12 ] There are a number of tests that are used by ophthalmologists and optometrists during eye examinations to determine the presence of astigmatism and to quantify the amount ...