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  2. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.

  3. Belay glasses - Wikipedia

    en.wikipedia.org/wiki/Belay_glasses

    Belay glasses are eyeglasses with prismatic lenses that are used by belayers in rock climbing to avoid the neck strain associated with belaying.

  4. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    By shifting the focus of the target image. This is typically achieved by making the objective lens group of the telescopic sight adjustable so the target focus can be moved into coplanarity with a fixed reticle. These models are often called adjustable objective (AO or A/O for short) models.

  5. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

  6. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.

  7. Strabismus - Wikipedia

    en.wikipedia.org/wiki/Strabismus

    Glasses affect the position by changing the person's reaction to focusing. Prisms change the way light, and therefore images, strike the eye, simulating a change in the eye position. Surgery. Strabismus surgery does not remove the need for a child to wear glasses. Currently it is unknown whether there are any differences for completing ...