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  2. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    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. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    If they correct for far distance, the person must accommodate to see up close. If the person cannot accommodate, they may need a separate correction for near distances, or else use a multifocal lens (see below). Reading glasses are single vision lenses designed for near work and include over the counter glasses.

  4. Glare (vision) - Wikipedia

    en.wikipedia.org/wiki/Glare_(vision)

    This could arise for instance when driving westward at sunset. Disability glare is often caused by the inter-reflection of light within the eyeball, reducing the contrast between task and glare source to the point where the task cannot be distinguished. When glare is so intense that vision is completely impaired, it is sometimes called dazzle.

  5. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

    www.aol.com/10-great-sites-buy-cheap-140036394.html

    Here are 10 affordable places to buy your next pair of cheap prescription glasses online. 1. Warby Parker. If you’re looking for a lot of choice (and the modern convenience of trying on eyeglass ...

  6. Automotive night vision - Wikipedia

    en.wikipedia.org/wiki/Automotive_night_vision

    An automotive night vision system uses a thermographic camera to increase a driver's perception and seeing distance in darkness or poor weather beyond the reach of the vehicle's headlights. Such systems are offered as optional equipment on certain premium vehicles.

  7. Night-vision device - Wikipedia

    en.wikipedia.org/wiki/Night-vision_device

    First-person view through night-vision goggles of the FBI Hostage Rescue Team using an airboat. A night-vision device ( NVD ), also known as a night optical/observation device ( NOD) or night-vision goggle ( NVG ), is an optoelectronic device that allows visualization of images in low levels of light, improving the user's night vision.

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