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  2. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    Bifocals can contribute to falls, [15] cause headaches, and even dizziness for some wearers. Adaptation to the small field of view offered by the reading segment of bifocals can take some time, as the user learns to move either the head or the reading material rather than the eyes.

  3. Dizziness - Wikipedia

    en.wikipedia.org/wiki/Dizziness

    Dizziness is a common medical complaint, affecting 20–30% of persons. [4] Dizziness is broken down into four main subtypes: vertigo (~25–50%), disequilibrium (less than ~15%), presyncope (less than ~15%), and nonspecific dizziness (~10%). [5] Vertigo is the sensation of spinning or having one's surroundings spin about them. Many people find ...

  4. Vertigo - Wikipedia

    en.wikipedia.org/wiki/Vertigo

    Dizziness affects approximately 20–40% of people at some point in time, while about 7.5–10% have vertigo. [3] About 5% have vertigo in a given year. [10] It becomes more common with age and affects women two to three times more often than men. [10] Vertigo accounts for about 2–3% of emergency department visits in the developed world. [10]

  5. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...

  6. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses have one focal length, but it is variable without having to change where one is looking. Possible uses for such glasses are to provide inexpensive eyeglasses for people from low-income groups , developing countries , third world countries or to accommodate for presbyopia.

  7. “Fallout” Star Walton Goggins Debuts Line of Sunglasses That ...

    www.aol.com/fallout-star-walton-goggins-debuts...

    Walton Goggins Goggle Glasses, a new line of sunglasses "It's just a cool retro experience," he tells PEOPLE of the glasses, which come with both a goggles strap and regular glasses arms.

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  9. Vestibulo-ocular reflex - Wikipedia

    en.wikipedia.org/wiki/Vestibulo-ocular_reflex

    If the gain of the VOR is wrong (different from 1)—for example, if eye muscles are weak, or if a person puts on a new pair of eyeglasses—then head movement results in image motion on the retina, resulting in blurred vision. Under such conditions, motor learning adjusts the gain of the VOR to produce more accurate eye motion. This is what is ...

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