英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

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]


请选择你想看的字典辞典：
单词字典翻译
astigmatism查看　astigmatism　在百度字典中的解释百度英翻中〔查看〕
astigmatism查看　astigmatism　在Google字典中的解释Google英翻中〔查看〕
astigmatism查看　astigmatism　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • 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 - Wikipedia
    Astigmatism, whether it is regular or irregular, is caused by some combination of external (corneal surface) and internal (posterior corneal surface, human lens, fluids, retina, and eye-brain interface) optical properties In some people, the external optics may have the greater influence, and in other people, the internal optics may predominate Importantly, the axes and magnitudes of
  • 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 Instead of having one curve like a round ball, the surface is egg-shaped
  • Astigmatism: What It Is, Symptoms, Tests Treatment
    Astigmatism is a common issue that makes your vision blurry Learn what causes it and how eye doctors manage it
  • American Academy of Ophthalmology
    What Is Astigmatism? Astigmatism is an imperfection in the normal curvature of your eye’s cornea or lens In this article: Video: What Is Astigmatism? What Causes Astigmatism? H
  • 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 Severity Scale: How to Determine Your Level
    Astigmatism is a common eye condition that causes blurry vision, eye strain, and distortion Learn more about the astigmatism severity scale here
  • Astigmatism vs. Normal Eyesight: What it Looks Like
    An astigmatism can render the entire world blurry Here's what this irregularity in eye shape means regarding how the world looks with astigmatism vs normal vision
  • 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: Causes, Definition, Types, Treatment - All About Vision
    Astigmatism is an irregular curve in your eye that can cause blurry vision and other symptoms Here's how an eye doctor can help you see clearly again





中文字典-英文字典  2005-2009