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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. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...

  3. 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 ...

  4. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    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.

  5. Eyebuydirect - Wikipedia

    en.wikipedia.org/wiki/Eyebuydirect

    Eyebuydirect, Inc. is an online retailer of prescription glasses, based in Austin, Texas. [1][2][3][4] The company also sells prescription and non-prescription sunglasses, sport sunglasses, and computer glasses designed to reduce glare. [5] Eyebuydirect was founded in 2005 by Roy Hessel, who was succeeded by Sunny Jiang, chief executive officer ...

  6. GPS for the visually impaired - Wikipedia

    en.wikipedia.org/wiki/GPS_for_the_visually_impaired

    Letting the user save points that are important to them. The app will alert the user when they approach the point. The users can define the alert distance separately for each point. Accessible map: The user can slide their finger on the screen and the app will announce the area or street address (depending on zoom) under their finger.

  7. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

  8. Eye tracking - Wikipedia

    en.wikipedia.org/wiki/Eye_tracking

    Eye tracking. Scientists track eye movements in glaucoma patients to check vision impairment while driving. Eye tracking is the process of measuring either the point of gaze (where one is looking) or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions and eye movement.

  9. Smartglasses - Wikipedia

    en.wikipedia.org/wiki/Smartglasses

    Man wearing a 1998 EyeTap, Digital Eye Glass. [1] Smartglasses or smart glasses are eye or head-worn wearable computers. Many smartglasses include displays that add information alongside or to what the wearer sees. [1][2][3] Alternatively, smartglasses are sometimes defined as glasses that are able to change their optical properties, such as ...

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