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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: Causes, Symptoms, Diagnosis, and Treatment - WebMD
    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: What It Is, Symptoms, Tests Treatment
    Astigmatism is a common refractive error that makes your vision blurry It means that some part of your eye (either the cornea or the lens) is more curved than it should be
  • 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 - National Eye Institute
    Learn about the symptoms, causes, diagnosis, and treatment of astigmatism
  • What Is Astigmatism? Causes And Effective Treatments
    Arming yourself with accurate knowledge about what astigmatism is, its causes, symptoms of astigmatism, and effective astigmatism treatment is the key to proactively protecting your eyes
  • Types of Astigmatism with Examples: What You Need to Know
    Astigmatism can be a significant hurdle, often leaving individuals feeling confused and overwhelmed It can be classified into two main types of astigmatism with examples, which are regular and irregular Regular astigmatism occurs when the main meridians of the eye are at right angles to one another, typically due to a uniformly shaped cornea
  • Astigmatism - Symptoms 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 Glasses, Lens, Vision Test, Causes, Treatment
    Astigmatism is an eye condition in which the cornea is abnormally curved and causes out-of-focus vision Learn about the causes, symptoms, diagnosis, and treatment
  • Astigmatism: Causes, Test, Symptoms, Glasses, Surgery, Reversible
    The word astigmatism comes from the Greek "a" meaning "without" and "stigma" meaning "spot " In astigmatism, a point (or spot) of light is focused at two different planes, causing blurred vision An optical system (or eye) without astigmatism has only one focus for all rays of light
  • What Is Astigmatism? Symptoms, Causes, Diagnosis, Treatment
    Astigmatism is caused by a cornea or lens that has a different shape than normal Astigmatism is very common Doctors don't know why the shape of the cornea or lens varies from person to person But they do know the risk of getting astigmatism is inherited (passed down from parents)





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