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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

    Other symptoms can include eyestrain, headaches, and trouble driving at night. [1] Astigmatism often occurs at birth and can change or develop later in life. [5] If it occurs in early life and is left untreated, it may result in amblyopia. [2] The cause of astigmatism is unclear, although it is believed to be partly related to genetic factors.

  4. Aberrations of the eye - Wikipedia

    en.wikipedia.org/wiki/Aberrations_of_the_eye

    Besides, there is strong evidence of compensation for aberrations between the cornea and intraocular optics in cases of astigmatism (horizontal/vertical) and horizontal coma. The balance of corneal and internal aberrations is a typical example of creating two coupling optical systems.

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

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

    The consultation, Trent says, is “the very first time I've had a doctor tell me about my astigmatism, and how bad it is, and that it may not be causing my vertigo or some of my eye movement ...

  6. Alpins method - Wikipedia

    en.wikipedia.org/wiki/Alpins_method

    Developed by Australian ophthalmologist Noel Alpins and introduced in 1993, the Alpins Method provides a coherent basis for reporting astigmatism results, and on this basis became the standard in the major ophthalmology journals, [9] [10] [11] and was accepted worldwide for studies that include refraction and corneal astigmatism measurements.

  7. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.

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