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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 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 Severity Scale: How to Determine Your Level
    Understanding the astigmatism severity scale can help you find the best solution to maintain sharp eyesight In this article, we’ll discuss the severity scale, the impact of astigmatism, and possible treatment options
  • Astigmatism - Symptoms causes - Mayo Clinic
    Astigmatism occurs when either the front surface of the eye (cornea) or the lens inside the eye has mismatched curves Instead of having one curve like a round ball, the surface is egg-shaped
  • Astigmatism - Diagnosis treatment - Mayo Clinic
    Astigmatism is diagnosed with an eye exam A complete eye exam involves both a series of tests to check eye health and a refraction, which determines how the eyes bend light Your eye doctor may use various instruments, aim bright lights directly at your eyes and ask you to look through several lenses
  • What Do the Numbers on Your Astigmatism Prescription Mean?
    Your astigmatism prescription isn’t a secret code—it’s a map to better vision By understanding the SPH, CYL, and axis numbers, you can talk more confidently with your doctor, choose the right correction, and make sure your glasses or contacts work as well as possible
  • Astigmatism - Wikipedia
    In an eye with astigmatism, either the lens or the cornea is slightly egg-shaped, with higher curvature in one direction than the other This gives distorted or blurred vision at any distance and requires corrective lenses that apply different optical powers at different rotational angles [1]
  • What’s the Range of Astigmatism? A Complete Explain
    Astigmatism isn’t a one-size-fits-all condition—it ranges from mild (so subtle you might not notice it) to severe (needing urgent correction) Understanding this range helps you know when to act, what treatments work best, and how to protect your vision
  • Astigmatism: Causes, Definition, Types, Treatment - All About Vision
    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 eyeball The optic nerve transmits nerve impulses from the retina to the brain, which translates them into eyesight
  • Astigmatism Severity Scale: Understand the Levels of Astigmatism
    Learn about the astigmatism severity scale, from mild to severe, based on diopters (D) and how it affects vision clarity and correction needs
  • How doctors measure the severity of your astigmatism
    Astigmatism is a common vision issue that can range from mild to severe Learn how your eye doctor determines the severity of your astigmatism and how the severity impacts treatment





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