News tagged with astigmatism
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. The term comes from the Greek α- (a-) meaning "without" and στίγμα (stigma), "a mark, spot, puncture".
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Researchers develop optimal algorithm for determining focus error in eyes and cameras
University of Texas at Austin researchers have discovered how to extract and use information in an individual image to determine how far objects are from the focus distance, a feat only accomplished by human and animal visual ...
Technology / Computer Sciences
Sep 26, 2011 |
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Optometrists make custom contact lenses for long-underserved patients
While the majority of patients with common vision problems can find glasses or contact lenses fairly easily, others who suffer from diseases of the eye that affect the focus of light have more limited options ...
May 13, 2009 |
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Adolescent vision screenings may miss farsightedness and astigmatism
Among adolescents, visual acuity tests appear to reliably detect vision problems caused by nearsightedness but not farsightedness or astigmatism, according to a report in the July issue of Archives of Ophthalmology.
Medicine & Health / Diseases, Conditions, Syndromes
Jul 12, 2010 |
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