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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: 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 - 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: Symptoms, Tests Treatment - Cleveland Clinic
    Astigmatism is a common type of refractive error It means that some part of your eye (either the cornea or lens) is more curved than it should be This altered eye shape makes your vision blurry Most cases of astigmatism can be treated with corrective lenses like eyeglasses or contact lenses
  • Astigmatism Explained: Causes, Diagnosis, Treatment - American Academy . . .
    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?
  • 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
  • Understanding the Astigmatism Severity Scale - Vision Center
    Astigmatism is a common refractive error that causes blurry vision, eye strain, and vision distortion However, not every case of astigmatism is equal Understanding the astigmatism severity scale can help you find the best solution to maintain sharp eyesight
  • Astigmatism Q A - Symptoms, Causes, Treatment
    Astigmatism is a type of refractive error that results in blurred or fuzzy vision It is a very common eye condition, affecting approximately 1 in 3 people in their lifetime
  • Managing Irregular Astigmatism | Eduardo Besser, MD
    Irregular astigmatism can cause blurred or distorted vision Discover the types, symptoms, causes, and treatments to protect your long-term eye health





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