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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 - 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: Causes, Types, Symptoms Treatment - Healthline
    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 - National Eye Institute
    Astigmatism is a common eye problem that can make your vision blurry or distorted It happens when your cornea (the clear front layer of your eye) or lens (an inner part of your eye that helps the eye focus) has a different shape than normal Learn about the symptoms, causes, diagnosis, and treatment of astigmatism
  • Astigmatism: Causes, Test, Symptoms, Glasses, Surgery, Reversible
    Astigmatism is a common form of visual impairment in which an image is blurred due to an irregularity in the curvature of the front surface of the eye, the cornea In astigmatism, the curve of the cornea is shaped more like an American football or a rugby ball rather than a normal spherical basketball
  • Astigmatism Q A - Symptoms, Causes, Treatment - Advanced Family Eye Care
    Astigmatism is a very common eye condition, resulting from an abnormality in the shape of the eye Around 1 in 3 people will require treatment for astigmatism, which can be easily corrected with toric contact lenses, eye glasses, or surgery
  • 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
  • Understanding Astigmatism: Causes, Symptoms, Treatment, and FAQs
    Astigmatism is a prevalent vision condition that affects millions of people worldwide It occurs when the cornea or lens of the eye has an irregular shape, which causes light to focus improperly on the retina This results in blurred or distorted vision
  • Astigmatism - American Academy of Ophthalmology
    Astigmatism is an imperfection in the normal curvature of your eye’s cornea or lens Video: What Is Astigmatism? What Causes Astigmatism? How Does Astigmatism Affect Vision? How Can You Tell if You Have Astigmatism? How Is Astigmatism Diagnosed? How Is Astigmatism Corrected? What Do Astigmatism Measurements Mean on Your Eye Prescription?
  • What Is Astigmatism and How Can It Be Corrected? - Dean McGee Eye Institute
    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





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