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  2. Varifocal lens - Wikipedia

    en.wikipedia.org/wiki/Varifocal_lens

    The change in the subject size is a significant problem in video and true parfocal designs are needed for higher quality video work. Varifocal lenses can be used for image display as well as capture, and Meta's Reality Labs has confirmed developing a varifocal display for virtual reality. [2] A varifocal lens. Left image is at 2.8 mm, in focus.

  3. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    When you look to your right, your right eye views distal (i.e. looking through the lens near to the arm of the spectacles) while your left eye views nasal (i.e. looking through the lens near to the bridge). Modern sophisticated progressive lenses are designed asymmetrically for greater patient acceptance and include special designs to cater to ...

  4. Zoom lens - Wikipedia

    en.wikipedia.org/wiki/Zoom_lens

    Lenses of this kind are now called varifocal lenses, since when the focal length is changed, the position of the focal plane also moves, requiring refocusing of the lens after each change. The first true zoom lens, which retained near-sharp focus while the effective focal length of the lens assembly was changed, was patented in 1902 by Clile C ...

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    www.aol.com/colors-cats-see-heres-pet-110109011.html

    From velvety purples to fiery reds, many people can see a spectrum of vivid colors via the human eye. Others, however, may have limited hue perception due to certain conditions.

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    Cyber Monday deals have arrived: Shop deals on Apple AirTags, Bissell vacuums, Cuisinart cookware, beauty stocking stuffers, and clothes for the whole family.

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