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  2. X-ray specs - Wikipedia

    en.wikipedia.org/wiki/X-ray_specs

    X-ray specs or X-ray glasses are an American novelty item, purported to allow users to see through or into solid objects. In reality, the spectacles merely create an optical illusion; no X-rays are involved. The current paper version is sold under the name "X-Ray Spex"; a similar product is sold under the name "X-Ray Gogs".

  3. See-through display - Wikipedia

    en.wikipedia.org/wiki/See-through_display

    A see-through display or transparent display is an electronic display that allows the user to see what is shown on the screen while still being able to see through it. The main applications of this type of display are in head-up displays , augmented reality systems, digital signage, and general large-scale spatial light modulation .

  4. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

  5. Meta's Orion Smart Glasses Could Be Revolutionary: Is the $2 ...

    www.aol.com/metas-orion-smart-glasses-could...

    Orion is actually big step forward over Meta's previous offerings. Meta's Quest VR goggles don't look like regular glasses and aren't transparent. Meanwhile, last year's unveiling of Ray-Ban smart ...

  6. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken ...

  7. Glass - Wikipedia

    en.wikipedia.org/wiki/Glass

    [44] [59] Although generally transparent to visible light, glasses may be opaque to other wavelengths of light. While silicate glasses are generally opaque to infrared wavelengths with a transmission cut-off at 4 μm, heavy-metal fluoride and chalcogenide glasses are transparent to infrared wavelengths of 7 to 18 μm. [60]

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