89 lines
4.9 KiB
Plaintext
89 lines
4.9 KiB
Plaintext
ÜÜÜÜÜÜÜÜÜÜÜÜÜ ÜÜÜ ÜÜÜÜ
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ÜÛÛÛÛÛÛÛÛßÛßßßßßÛÛÜ ÜÜßßßßÜÜÜÜ ÜÛÜ ÜÛÛÛÛÛÛÛÛÜÜÜÜÜÛßß ßÛÛ
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ßÛÛÛÛÛÛÛÛÛÛÛÛÛÛÜ ßÛÛ ÜÛÛÛÜÛÛÜÜÜ ßÛÛÛÛÜ ßÛÛÛÛÛÛÛÜÛÛÜÜÜÛÛÝ Ûß
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ßßßÛÛÛÛÛÛÛÛÛÛÜ ÞÝ ÛÛÛÛÛÛÛÛÛÛÛßßÛÜÞÛÛÛ ÛÛÛÛÛÜ ßßÛÛÛÞß
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Mo.iMP ÜÛÛÜ ßÛÛÛÛÛÛÛÝÛ ÞÛÛÛÛÛÛÛÛÛ ÞÛÛÛÛ ÞÛÛÛÛÛÝ ßÛß
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ÜÛÛÛÛÛÛÛ ÛÛÛÛÛÛÛÛÝ ÞÛÛÛÛÛÛÛÛÝ ÛÛÛ ÛÛÛÛÛÛ
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ÜÛÛÛÛÛÛÛÝ ÞÛÛÛÛÛÛÛÛ ÞÛÛÛÛÛÛÛÛ ß ÞÛÛÛÛÛÛÜ ÜÛ
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ÜÛÛÛÛÛÛÛÝ ÛÛÛÛÛÛÛÛ ÛÛÛÛÛÛÛÛÝ ÞÞÛÛÛÛÛÛÛÛÛß
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ÜÛßÛÛÛÛÛÛ ÜÜ ÛÛÛÛÛÛÛÛÝ ÛÛÞÛÛÛÛÛÝ ÞÛÛÛÛÛÛßß
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ÜÛßÛÛÛÛÛÛÜÛÛÛÛÜÞÛÛÛÛÛÛÛÛ ÞÛ ßÛÛÛÛÛ Ü ÛÝÛÛÛÛÛ Ü
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ÜÛ ÞÛÛÛÛÛÛÛÛÛÛß ÛÛÛÛÛÛÛÛÛ ßÛÜ ßÛÛÛÜÜ ÜÜÛÛÛß ÞÛ ÞÛÛÛÝ ÜÜÛÛ
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ÛÛ ÛÛÛÛÛÛÛÛß ÛÛÛÛÛÛÛÛÛÛÜ ßÛÜ ßßÛÛÛÛÛÛÛÛÛß ÜÜÜß ÛÛÛÛÜÜÜÜÜÜÜÛÛÛÛÛß
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ßÛÜ ÜÛÛÛß ßÛÛÛÛÛÛÛÛÛÛÜ ßßÜÜ ßßÜÛÛßß ßÛÛÜ ßßßÛßÛÛÛÛÛÛÛßß
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ßßßßß ßßÛÛß ßßßßß ßßßßßßßßßßßßß
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ARRoGANT CoURiERS WiTH ESSaYS
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Grade Level: Type of Work Subject/Topic is on:
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[ ]6-8 [ ]Class Notes [University of Toronto ]
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[x]9-10 [ ]Cliff Notes [Professors find Better ]
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[ ]11-12 [x]Essay/Report [Ways to Test Sight in ]
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[ ]College [ ]Misc [Babies ]
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Dizzed: 10/94 # of Words:556 School: ? State: ?
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ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>Chop Here>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ
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U OF T PROFESSORS DEVISE BETTER WAY TO TEST SIGHT IN BABIES
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In a darkened room at Toronto's Hospital for Sick Children, a baby, its
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head dotted with electrodes, sits in its mother's lap and watches flashing
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black and white checkerboards and stripes on a television screen. Soon
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after the test, doctors will know if the child can see and how well it can
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see.
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The testing procedure, which involves measuring brain wave activity
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prompted by visual stimuli (also called visual evoked potentials or VEP's)
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has been perfected by Drs. Barry Skarf of the Department of Ophthalmology
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and Moshe Eizenman of U of T's Institute
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Their procedure is more accurate than tests used elsewhere because
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Eizenman has developed a novel, real-time computer program to extract brain
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wave responses from extremely small patterns (similar in size to the bottom
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line of a standard eye test) which produce much more reliable results.
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Until now, doctors would have to extrapolate the baby's ability to see
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small stimuli from test results using large stimuli. "In Effect, Dr.
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Eizenman has developed a way of looking at brain waves that is more
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sensitive than methods previously available, " says Skarf.
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At the HSC, VEP's are used in a number of clinical applications: to
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determine whether a visual problem is cognitive; to assess whether babies
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who don't appear to see well will see better in the future; to determine a
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course of treatment for such problems in which one eye turns in or is
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weaker than the other eye. The second aspect of the researchers' work
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involves the development of a stimulator for stereopsis, or binocular
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vision, which is the fusing of images from both eyes into one picture that
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has depth. "The problem with testing binocular vision, " explains Skarf,
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"is that most stimuli presented to young children have other cues that can
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be seen with one eye alone. We wanted to devise stimuli that can only be
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seen by both eyes together and would produce specific brain waves to the
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stimuli."
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Based on a binocular stimulus invented by an American researcher,
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Eizenman had developed a stimulus that generates a pattern on a tv screen
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which looks like distortion (a snow storm) when viewed with only one eye,
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but when viewed through special glasses with both eyes emits a distinctive
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three- dimensional pattern.
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Skarf and Eizenman are now testing binocular VEP's on young children.
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They are examining children with normal sight and evaluating eye function
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in children with visual disorders. This is the first test of binocular
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vision to be carried out with large numbers. "Using this binocular stimulus
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with the very sensitive detector system for analyzing responses, we hope to
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have a system which will allow us to test binocular vision in young babies,
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quickly and easily, and to measure responses in a better way than before."
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In addition to this clinical research, Skarf now wants to direct his
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attention to some basic research questions about the development of vision.
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"We are interested in more than just developing tools. We want to know how
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binocular vision develops and which factors interfere with development. We
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want to find out what wheels turn in the brain to produce lazy eyes and
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impaired binocular vision."
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Skarf and Eizenman receive funding from the Medical Research Council of
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Canada.
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CONTACT:
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Barry Skarf (416)598-6133
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Moshe Eizenman (416)978-5523
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