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  2. Astigmatism (optical systems) - Wikipedia

    en.wikipedia.org/wiki/Astigmatism_(optical_systems)

    Astigmatism causes difficulties in seeing fine detail. Astigmatism can be often corrected by glasses with a lens that has different radii of curvature in different planes (a cylindrical lens), contact lenses, or refractive surgery. [5] Astigmatism is quite common. Studies have shown that about one in three people suffers from it.

  3. Astigmatism - Wikipedia

    en.wikipedia.org/wiki/Astigmatism

    Mild astigmatism has a higher prevalence than moderate and significant astigmatisms and increased until the age of 70, while moderate and significant astigmatisms showed an increase in prevalence after the age of 70. [33] Of the levels of astigmatism, mild astigmatism is most prevalent, making up about 82% of the total reported astigmatisms. [33]

  4. Limbal relaxing incisions - Wikipedia

    en.wikipedia.org/wiki/Limbal_relaxing_incisions

    Limbal relaxing incisions (LRI) are a refractive surgical procedure to correct minor astigmatism in the eye. Incisions part way through the cornea are made at one side or at opposite edges of the cornea, following the curve of the iris, causing a slight flattening of the cornea in that area. [1]

  5. “7 Little Johnstons”' Trent Learns for 'Very First Time ...

    www.aol.com/7-little-johnstons-trent-learns...

    After receiving some scary results from an MRI last week, Trent Johnston continues to undergo medical tests and meets with an eye doctor in the new episode of TLC’s 7 Little Johnstons.. In a ...

  6. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. The goal is to bring vision up to 20/20 vision or as close to this as possible. Glasses or "spectacles" are corrective lenses worn on the face a short distance in front of the eye.

  7. Aberrations of the eye - Wikipedia

    en.wikipedia.org/wiki/Aberrations_of_the_eye

    It has only recently [when?] become possible to measure the aberrations of the eye and with the advent of refractive surgery it might be possible to correct certain types of irregular astigmatism. The appearance of visual complaints such as halos , glare and monocular diplopia after corneal refractive surgery has long been correlated with the ...