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  2. Farsightedness - Wikipedia

    en.wikipedia.org/wiki/Farsightedness

    Diagnosis is based on an eye exam. [5] [8] Management can occur with eyeglasses, contact lenses, or refractive corneal surgeries. [2] Glasses are easiest while contact lenses can provide a wider field of vision. [2] Surgery works by changing the shape of the cornea. [5]

  3. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Legally blind indicates that a person has less than 20/200 vision in the better eye after best correction (contact lenses or glasses), or a field of vision of less than 20 degrees in the better eye. Totally blind students learn via braille or other non-visual media.

  4. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    When the pupil is small (1–2 mm), image sharpness may be limited by diffraction of light by the pupil (see diffraction limit). Between these extremes is the pupil diameter that is generally best for visual acuity in normal, healthy eyes; this tends to be around 3 or 4 mm. If the optics of the eye were otherwise perfect, theoretically, acuity ...

  5. I'm blind. My eyes are different sizes and colors. Will I ...

    www.aol.com/news/eyes-different-sizes-colors...

    My right eye is lazy, shriveled and blind; it moves like an out-of-control marble circling a drain. My left eye suffers hemorrhages that can cause episodes of total blindness.

  6. Relative afferent pupillary defect - Wikipedia

    en.wikipedia.org/wiki/Relative_afferent_pupillar...

    Marcus Gunn pupil: The left optic nerve and the optic tracts. A Marcus Gunn pupil indicates an afferent defect, usually at the level of the retina or optic nerve. Moving a bright light from the unaffected eye to the affected eye would cause both eyes to dilate, because the ability to perceive the bright light is diminished. Specialty ...

  7. Aphakia - Wikipedia

    en.wikipedia.org/wiki/Aphakia

    Aphakia is the absence of the lens of the eye, due to surgical removal, such as in cataract surgery, a perforating wound or ulcer, or congenital anomaly. It causes a loss of ability to maintain focus (accommodation), high degree of farsightedness (), [1] and a deep anterior chamber.