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Previous Volume 361:100-101 July 2, 2009 Number 1 Next

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By Susan R. Barry. 249 pp., illustrated. New York, Basic Books, 2009. $26. ISBN 978-0-465-00913-8.

Seeing the three-dimensional world with two-dimensional retinas presents the brain with two problems. To locate an object in space requires depth perception, which can be acquired from one eye alone through size, perspective, and motion parallax. Stereopsis is an entirely different quality that gives the world dimensionality; it requires binocular vision. Strabismus is the main reason for disrupted stereopsis, although binocular vision fails to develop in a few ostensibly normal persons. This book is about what people with disrupted stereopsis are missing and how the condition can be remedied even late in life.

Susan Barry crafts a story from her . . . [Full Text of this Article]

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