Online Google Dictionary

astigmatic 中文解釋 wordnet sense Collocation Usage Collins Definition
  1. of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images
  2. (astigmatism) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
  3. (astigmatism) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
  4. (Astigmatism) An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. ...
  5. (Astigmatism (eye)) Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. This may be due to an irregular or toric curvature of the cornea or lens. ...
  6. (astigmatism) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred; A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image
  7. (astigmatism) a vision problem that results in blurred images.
  8. (astigmatism) Condition in which the cornea's curvature is asymmetrical (the eye is shaped like a football or egg instead of a baseball); light rays are focused at two points on the retina rather than one, resulting in blurred vision. ...
  9. (astigmatism) (uh-STIG-muh-tiz-um). Optical defect in which refractive power is not uniform in all directions (meridians). Light rays entering the eye are bent unequally by different meridians, which prevents formation of a sharp image focus on the retina. ...
  10. (Astigmatism) The uneven foreground and background blue that is in an image.
  11. (Astigmatism) A condition that occurs when an uneven curvature of the eye causes light to be refracted (bent) unevenly, resulting in distorted vision.
  12. (Astigmatism) most often encountered with inferior ground optics, an aberration in which light doesn't come to focus at the same plane.
  13. (Astigmatism) (uh-STIG-muh-tism) The visual defect attributable to the presence of an elliptical (i.e. that is egg or rugby ball shaped) rather than spherical shape in the refracting surfaces of the eye. This results in the diffusion of light rays with one axis being more in focus than the other.
  14. (astigmatism) a condition when the cornea, and sometimes the lens, curves differently in different directions. This causes light to bend differently when it focuses on the retina. The image is thus blurred or ghosted unless corrected by contact lenses or spectacles.
  15. (Astigmatism) lines in some directions are focused less sharply than lines in other directions,
  16. (Astigmatism) Where an irregular shape of the cornea prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.
  17. (Astigmatism) An eye condition in which the lens doesn't focus light evenly on the retina, leading to problems with visual sharpness.
  18. (Astigmatism) Structural defects of the eye in which the light rays from a viewed object do not meet in a single focal point, resulting in blurred images being sent to the brain. ...
  19. (Astigmatism) A condition where the cornea is irregularly shaped, causing distorted vision especially at near distances. Either prescription glasses or Toric contact lenses can correct astigmatism for most people.
  20. (astigmatism) a condition in which the surface of the cornea is not spherical; causes a blurred image to be received at the retina. Condition can be corrected with glasses.
  21. Astigmatism is one of a group of eye conditions known as refractive errors. Refractive errors cause a disturbance in the way that light rays are focused within the eye. Astigmatism often occurs with nearsightedness and farsightedness, conditions also resulting from refractive errors. ...
  22. (Astigmatism) A vision condition that causes blurred vision due either to the irregular shape of the cornea, the clear front cover of the eye, or sometimes the curvature of the lens inside the eye.
  23. (Astigmatism) a refractive error caused when a cornea is shaped more like a football than a soccer ball, 2 different radius of curvature. The image is being focused in two places on the retina and the corrective lens is used to “twist” them into a single point of focus.
  24. (Astigmatism) With a name more ominous than its prognosis, this form of blurry vision due to an irregularly shaped cornea is commonly correctable with glasses, contact lenses or refractive surgery.
  25. (astigmatism) The shape variation in the cornea which causes it to be curved more in one direction than another (shaped more like a football than a basketball).