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".
For more information about Astigmatism, read the full article at
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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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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.
Jul 12, 2010 |
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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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Search results for astigmatism
Optometry experts prove the effectiveness of orthokeratology in myopic control
After a lengthy study spanning over four years, Professor Pauline Cho from the School of Optometry at The Hong Kong Polytechnic University (PolyU) and her research team concluded that orthokeratology not only can correct ...
Jan 11, 2012 |
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Beyond brain scanning: Simultaneous high-resolution 3D neural imaging and photostimulation
(Medical Xpress) -- Neuroanatomy and neurophysiology are inherently three-dimensional domains. Neuronal cell body projections – axons and dendrites – can interconnect large numbers of neurons distributed ...
Medicine & Health / Neuroscience
Nov 28, 2011 |
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Vitamin B-based treatment for corneal disease may offer some patients a permanent solution
Patients in the United States who have the cornea-damaging disease keratoconus may soon be able to benefit from a new treatment that is already proving effective in Europe and other parts of the world. The ...
Oct 24, 2011 |
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K-B mirrors harness X-rays for science
(PhysOrg.com) -- Up close, they look simple as can be: a pair of metal bars, each with one side polished to a brilliant shine. One bar faces up, the other to one side.
Oct 12, 2011 |
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R&D collaboration focuses on new system for measuring and improving human vision
With research and development assistance from the Georgia Tech Research Institute (GTRI) and seed funding from the Georgia Research Alliance (GRA), an Atlanta-based company is developing what it hopes will ...
Jul 13, 2011 |
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On the cutting edge of laser eye surgery
Hindsight, unlike many people's vision, is always 20/20. Laser eye surgery has become so common, it's easy to forget that just three decades ago a promising new treatment was greeted with skepticism and even fear.
Jun 01, 2011 |
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New laser system shows promise for cataract surgery
(PhysOrg.com) -- Imagine trying to cut by hand a perfect circle roughly one-third the size of a penny. Then consider that instead of a sheet of paper, you're working with a scalpel and a thin, elastic, transparent ...
Nov 17, 2010 |
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Is photoscreening the best way to catch 'lazy eye'?
Amblyopia, known as "lazy eye," is a major cause of vision problems in children and a common cause of blindness in people aged 20 to 70 in developed countries. In amblyopia the person's stronger eye is favored and his/her ...
Oct 01, 2010 |
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The Medical Minute: Pediatric eye safety
Yes, the dog days of summer are upon us; for most families that signals the longstanding tradition of back to school preparation. It’s time to begin the search for the perfect backpack and notebook, shop for new clothing ...
Jul 29, 2010 |
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Simple, low-cost device that affixes to a cellphone could provide quick eye tests
There are two standard systems for determining a prescription for eyeglasses to correct refractive errors such as nearsightedness, farsightedness and astigmatism. One is to have the patient look through a ...
Jun 23, 2010 |
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List of search results for astigmatism
