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(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Answer for the clue "(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point ", 11 letters:
astigmatism
Alternative clues for the word astigmatism
Word definitions for astigmatism in dictionaries
WordNet
Word definitions in WordNet
n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea [syn: astigmia ] (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point [syn: astigmia ] [ant: ...
Longman Dictionary of Contemporary English
Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Despite what has been called the moral astigmatism of the Tuskegee study, not all of its lessons are negative. ▪ He said developments are expected within a year which will not only enable severe astigmatism to be corrected but ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Ametropia \Am`e*tro"pi*a\, n. [Gr. ? irregular + ?, ?, 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.
Wikipedia
Word definitions in Wikipedia
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 . The two ...
Wiktionary
Word definitions in Wiktionary
n. 1 (context optics English) 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. 2 (context pathology English) A disorder of the vision, usually due to a misshapen cornea, such that light ...
Usage examples of astigmatism.
Whenever defects in focusing are present, particularly in astigmatism, extra work is thrown on the ciliary muscle as well as the muscles that move the eyeballs.
In fact, a blind ophthalmologist is not much good to anyone, but it was up to him to inform the health authorities, to warn them of this situation which might turn into a national catastrophe, nothing more nor less, of a form of blindness hitherto unknown, with every appearance of being highly contagious, and which, to all appearances, manifested itself without the previous existence of earlier pathological symptoms of an inflammatory, infectious or degenerative nature, as he was able to verify in the blind man who had come to consult him in his surgery, or as had been confirmed in his own case, a touch of myopia, a slight astigmatism, all so mild that he had decided, in the meantime, not to use corrective lenses.
A mild childhood astigmatism worsened when she was thirteen: she started bumping into things and found it increasingly difficult to concentrate on the entomological textbooks and journals that she read voraciously.
Physical astigmatism is a distortion of the eye lenses that causes rays of light from an external point to converge unequally and form warped images.
Up to a point he had made considerable progress with the muscle imbalance that caused the astigmatism which affected all three of his eyes.
I have got rid of all the astigmatism in my right or left eye, yet center eye persists in being astigmatic, sometimes to the point of blindness.
He’ll be the glass, full of subtle colors and astigmatisms, through which all new things will be viewed.
He'll be the glass, full of subtle colors and astigmatisms, through which all new things will be viewed.
When you see a man with the lines of his face drooping, a healthy individual with a pensive eye, - suspect astigmatism.