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2. Humphrey visual field analyser - Wikipedia

   en.wikipedia.org/wiki/Humphrey_Visual_Field_Analyser

   The analyser will provide a lens strength and type (either spherical and/or cylindrical), if required for the test. In these instances, wire-rimmed trial lenses are generally used, with the cylindrical lens placed closest to the patient so the axis is easily read. The clinician can alter the fixation targets as per necessary (see Fixation ...

3. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím , who also invented the first gel used for their production.

4. 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.

5. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   For individuals sensitive to lens errors, the best way to eliminate lens induced aberrations is to use contact lenses. Contacts eliminate all these aberrations since the lens then moves with the eye. Barring contacts, a good lens designer does not have many parameters that can be traded off to improve vision.

6. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Astigmatism may be corrected with eyeglasses, contact lenses, or refractive surgery. [1] Glasses are the simplest and safest, although contact lenses can provide a wider field of vision . Refractive surgery can eliminate the need to wear corrective lenses altogether by permanently changing the shape of the eye but, like all elective surgery ...

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   www.aol.com/lifestyle/best-affordable-computer...

   Shoppers say this hassle-free option is the 'best bang for your buck.' This is the best affordable computer monitor 'you'll find anywhere' — and it's on sale Skip to main content

8. Contact lens - Wikipedia

   en.wikipedia.org/wiki/Contact_lens

   Artist's impression of Leonardo's method for neutralizing the refractive power of the cornea. Leonardo da Vinci is frequently credited with introducing the idea of contact lenses in his 1508 Codex of the eye, Manual D, [9] wherein he described a method of directly altering corneal power by either submerging the head in a bowl of water or wearing a water-filled glass hemisphere over the eye.

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