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Adults with lazy eye can improve

Young adults with amblyopia, or lazy eye, can improve substantially and retain their gains under a new treatment developed by researchers at USC and three Chinese universities.

A lazy eye in children appears normal but does not see properly, even with corrective lenses. If untreated, the eye will not develop fully, resulting in permanent loss of vision.

Amblyopia has been considered incurable in children older than eight. The new study, published online by Vision Research, documented a 70 percent improvement in eye chart performance in 19-year-old subjects. The average one-year retention rate was 90 percent.

The researchers trained the subjects in detection of a small "gabor" (pronounced ga-BOR), a set of three contrasting dark and light ovals that neurophysiologists have identified as a basic unit of visual perception.

Surprisingly, improvement in this abstract exercise generalized to a marked improvement in standard vision tests. The seven subjects improved their overall visual acuity 25 to 216 percent, with an average of 70 percent.

Another 10 subjects in a slightly different training program showed an average improvement of 46 percent. Eight subjects in a control group showed no improvement.

"Detecting simple visual patterns turned out to be quite useful for improving visual acuity for amblyopia patients, typically measured by eye chart reading," said co-author Zhong-Lin Lu, professor of psychology in the USC College of Letters, Arts and Sciences and co-director of the Dornsife Neuroscience Imaging Center.

"You train on one of these gabors, you can generalize this to a whole bunch of different gabors, and also generalize this to an eye chart. That makes it [the training] useful," Lu said.

Normal subjects who received the same training did not show a general improvement in vision. A possible reason may be that a little stimulus goes a long way toward awakening the amblyopic eye, Lu said.

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Contact: Carl Marziali
marziali@usc.edu
213-740-4751
University of Southern California
20-Dec-2005


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