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  2. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    where f c is the corrected focal length for the new lens, f is the focal length of the original lens, and x is the distance that the lens was moved. The value for x can be positive or negative depending on the sign convention. Lens power in diopters is the mathematical inverse of focal length in meters.

  3. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    The length of the progressive power gradient on the lens surface depends on the design of the lens, with a final addition power between 0.75 and 3.50 dioptres. The addition value prescribed depends on the level of presbyopia of the patient. In general the older the patient, the higher the addition.

  4. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses have one focal length, but it is variable without having to change where one is looking. Possible uses for such glasses are to provide inexpensive eyeglasses for people from low-income groups , developing countries , third world countries or to accommodate for presbyopia.

  5. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Switching between distance and near vision is accomplished by re-adjusting the lens, instead of by tilting and/or rotating the head. The need for constant adjustment when the person's attention switches to an object at a different distance is a design challenge of such a lens. Manual adjustment is more cumbersome than bifocals or similar lenses.

  6. 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.

  7. No. 25 Clemson, in mini-skid, looks to change course vs. Wake ...

    www.aol.com/no-25-clemson-mini-skid-080111192.html

    Dec 17, 2024; Columbia, South Carolina, USA; Clemson Tigers guard Chase Hunter (1) makes a three point basket with 0.3 seconds left in regulation to send the game to overtime in the second half of ...

  8. A busy longevity clinic owner is 33 but says her biological ...

    www.aol.com/busy-longevity-clinic-owner-33...

    Some research suggests that PEMF could be useful in treating osteoarthritis and bone fractures, but more evidence is needed to draw a connection, said the authors of a 2023 review of research ...

  9. Pupillary distance - Wikipedia

    en.wikipedia.org/wiki/Pupillary_distance

    Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]