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astigmatism    音标拼音: [əst'ɪgmət,ɪzəm]
n. 散光

散光

astigmatism
n 1: (ophthalmology) impaired eyesight resulting usually from
irregular conformation of the cornea; common in nearsighted
people [synonym: {astigmatism}, {astigmia}]
2: (optics) defect in an optical system in which light rays from
a single point fail to converge in a single focal point [synonym:
{astigmatism}, {astigmia}] [ant: {stigmatism}]

ametropia \am`e*tro"pi*a\ ([a^]m`[-e]*tr[=o]"p[i^]*[.a]), n.
[Gr. 'a`metros irregular 'w`ps, 'wpo`s, eye.] (Med.)
A visual impairment resulting from faulty refraction of light
rays in the eye. Subtypes include {myopia} {astigmatism} and
{hyperopia}. -- {Am`e*trop"ic} ([a^]m`[-e]*tr[o^]p"[i^]k), a.
AS
[1913 Webster PJC]


Astigmatism \A*stig"ma*tism\, n. [Gr. 'a priv. ?, ?, a prick
of a pointed instrument, a spot, fr. ? to prick: cf. F.
astigmatisme.] (Med. & Opt.)
A defect of the eye or of a lens, in consequence of which the
rays derived from one point are not brought to a single focal
point, thus causing imperfect images or indistinctness of
vision.
[1913 Webster]

Note: The term is applied especially to the defect causing
images of lines having a certain direction to be
indistinct, or imperfectly seen, while those of lines
transverse to the former are distinct, or clearly seen.
[1913 Webster]


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  • Astigmatism: Causes, Symptoms, Diagnosis, and Treatment
    Astigmatism is a condition where the cornea (the front part of the eye) isn't perfectly round, causing light to bend unevenly and making vision blurry or distorted
  • Astigmatism - Symptoms and causes - Mayo Clinic
    Astigmatism is a type of refractive error caused when either the cornea or the lens has mismatched curves This makes vision blurry because there are two image points
  • Astigmatism - Wikipedia
    Astigmatism is a vision problem that occurs when the lens or cornea of an eye are slightly egg-shaped rather than spherical The lack of rotational symmetry causes a refractive error that cannot be corrected with simple glasses
  • Astigmatism: What It Is, Symptoms, Tests Treatment
    What Is Astigmatism? If you have astigmatism, light that enters your eye bends unevenly This makes your vision blurry “Astigmatism” is the medical term that means your eye is oval-shaped It’s a type of refractive error These are very common eye issues that cause blurred vision
  • Astigmatism Explained: Causes, Diagnosis, Treatment - American Academy . . .
    Blurry vision? It might be astigmatism—but not all cases are the same Learn the real causes, symptoms, and treatment options
  • Astigmatism: Causes, Types, Symptoms Treatment
    Astigmatism is a common vision problem caused by an error in the shape of the cornea Learn about the different types, their symptoms, and how they're treated
  • Astigmatism - Harvard Health
    Some people describe it as double vision but in only one eye Some people with astigmatism develop eyestrain, squinting and headaches from working to focus on near or distant objects People are born with astigmatism, but it may not be noticed until a child begins to attend school or learns to read Diagnosing astigmatism
  • Astigmatism: Causes, Definition, Types, Treatment
    Astigmatism is a condition caused by subtle flaws in the way your eye bends light (a process called refraction) that passes to the retina, the light-sensitive area at the back of the eye The optic nerve transmits nerve impulses from the retina to the brain, which translates them into eyesight
  • Astigmatism Severity Scale: How to Determine Your Level
    Astigmatism occurs when the cornea or lens of your eye has an irregular shape, preventing light from focusing clearly on your retina The cornea's irregular shape is often compared to a football rather than a round shape
  • Astigmatism: Symptoms, Causes, Diagnosis, Treatment
    Astigmatism is a vision disorder caused by changes in the shape of the eye that causes blurriness, visual distortion, and difficulty seeing at night





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