American Heritage® Dictionary of the English Language, Fourth Edition
- n. A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.
Century Dictionary and Cyclopedia
- n. In ophthalmology, a defect in the refractive apparatus of the eye, the curvature of the refracting surfaces being greater along certain meridians than along others, so that rays of light proceeding from an external point do not converge to a point upon the retina, but to a line.
- n. A similar defect in a lens.
- n. optics 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.
- n. pathology 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.
GNU Webster's 1913
- n. (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.
- n. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
- n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
- From a- ("not") + stem of Ancient Greek στίγμα (stigma, "mark, point") + -ism (Wiktionary)
- a-1 + Greek stigma, stigmat-, point (from stizein, stig-, to tattoo; see steig- in Indo-European roots). (American Heritage® Dictionary of the English Language, Fourth Edition)
“After the surgery, I definitely saw better - my previous vision had been -7 and -7.5 with severe astigmatism, which is a short step away from being totally non-functional - but after two weeks, I went back in for another corrective round.”
“If your eye is squished on one side, called an astigmatism, your lenses should compensate for that.”
“There is an optical condition of the eye known as astigmatism, in which the cornea is usually at fault.”
“Another defect of the eye, known as astigmatism, is due to the fact that the eye does not always have a perfectly spherical front (cornea).”
“* '' 'Astigmatism:' '' An astigmatism occurs when the cornea or lens (or both) are not perfectly symmetrical.”
“Astigmatism: An astigmatism occurs when the cornea or lens (or both) are not perfectly symmetrical.”
“That produces a condition called astigmatism, the effect of which is to make images appear blurry whether near or far.”
“My solution was to make sure you get a scope with the "astigmatism" adjustment.”
“So long as the minds that perceive them are not affected by superficial or deepest causes for deceptive or distorted appearance-making – such as astigmatism, autism, or grasping for true unimputed existence – the cognitions of the appearances of us as usual humans or as Buddha-figures are equally valid.”
“What is known as reflex nervousness arises as a result of minor local conditions, such as astigmatism and other eye conditions, trouble with the nose and throat and trouble with the organs of generation.”
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