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astigmatism    音標拼音: [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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英文字典中文字典相關資料:
  • Astigmatism - Symptoms causes - Mayo Clinic
    Astigmatism (uh- STIG-muh-tiz-um) is a common and generally treatable imperfection in the curvature of the eye that causes blurred distance and near vision Astigmatism occurs when either the front surface of the eye (cornea) or the lens inside the eye has mismatched curves
  • Astigmatism - Wikipedia
    Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power The lens and cornea of an eye without astigmatism are nearly spherical, with only a single radius of curvature, and any refractive errors present can be corrected with simple glasses
  • Astigmatism Explained: Causes, Diagnosis, Treatment . . .
    Blurry vision? It might be astigmatism—but not all cases are the same Learn the real causes, symptoms, and treatment options
  • Astigmatism - National Eye Institute
    Learn about the symptoms, causes, diagnosis, and treatment of astigmatism
  • Astigmatism Guide: Causes, Symptoms and Treatment Options
    Astigmatism - an easy to understand guide covering causes, diagnosis, symptoms, treatment and prevention plus additional in depth medical information
  • What Is Astigmatism and How Can It Be Corrected?
    Astigmatism is a common vision condition that affects how the eye focuses light, leading to blurred or distorted vision at any distance It occurs when the cornea, the clear front surface of the eye, is irregularly shaped
  • Astigmatism: Signs and Symptoms - Health
    Astigmatism is a common eye condition that can cause vision distortion, resulting in symptoms like blurry vision and eye strain
  • Astigmatism: Causes, Symptoms, Diagnosis, and Treatment - WebMD
    Astigmatism - Learn more about the causes, symptoms, diagnosis, and treatment of this condition in which your eye isn’t completely round
  • Astigmatism: Your Complete Guide to Clearer Vision
    Astigmatism is an eye condition where your eyeball is not perfectly circular like a basketball, but is shaped more like a football, resulting in blurry or distorted vision if you are not corrected Symptoms of astigmatism While some people with astigmatism do not experience any symptoms, other people might experience any of the following: Blurry or distorted vision Eye strain irritation
  • What Is Astigmatism? Causes And Effective Treatments
    This article will serve as a comprehensive guide to astigmatism, leading you to explore every aspect of this refractive error We will delve into its basic definition, how to recognize signs of astigmatism, its causative factors, and accurate astigmatism diagnosis procedures





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