Susan Barry

Professor Emeritus of Biological Sciences
Stereovision, neuronal plasticity

For years, Sue Barry taught her neurobiology students the conventional wisdom- that the human brain is highly malleable during a “critical period” in infancy but loses the capacity to rewire in adulthood. She even used her own story to illustrate this point. Barry has been cross eyed since early infancy. Since her two eyes saw different things, she was prone to double vision. As a result, she learned as a very young child to shut down the input from one eye. Barry never developed stereovision or the ability to see in 3D. As an adult, she was told that it was too late to change. She would always be stereoblind.

In 2002, Barry embarked on a program of optometric vision therapy that taught her how to aim her two eyes at the same point in space. To her astonishment, her vision changed and her view transformed in ways that she could not previously have imagined. Large buildings on street corners loomed out toward her like the bows of giant ships. Tree branches reached upward and outward capturing palpable volumes of space through which the inner branches permeated. Barry was seeing in stereo depth for the first time.

This experience has led Barry to re-examine the subject of adult neuronal plasticity and rehabilitation, subjects she stresses both in her neurobiology classes and in her own writing. In 2009, she published a book titled, Fixing My Gaze: A Scientist's Journey into Seeing in Three Dimensions and then in 2021 expanded her discussion of sensory plasticity and recovery in her second book, Coming to Our Senses: A Boy Who Learned to See, A Girl Who Learned to Hear, and How We All Discover the World  More information about Barry and her books can be found at

Selected Publications

Barry SR. 2021. Coming to Our Senses: A Boy Who Learned to See, A Girl Who Learned to Hear, and How We All Discover the World.  New York: Basic Books.

Barry SR, Bridgeman B.  2017.  An Assessment of Stereovision Acquired in Adulthood.  Optometry and Vision Science 94:993-999.

Barry SR. 2009. Fixing My Gaze: A Scientist's Journey into Seeing in Three Dimensions. New York: Basic Books.

Bloomberg J.J., Merkle L.A., Barry S.R., Huebner W.P., Cohen H.S., Mueller S.A., Fordice J. 2000. Effects of adaptation of vestibulo-ocular reflex function on manual target localization. J Vestib Res. 10(2):75-86.

Nori V.S., Barry S.R. 1997. Toxic effects of antimalarial drugs in Paramecium: role of calcium channels. J Comp Physiol [A]. May;180(5):473-80.

Clark KI, Barry SR. 1994. Aminophylline enhances resting Ca2+ concentrations and twitch tension by adenosine receptor blockade in Rana pipiens. J Physiol. Nov 15;481 ( Pt 1):129-37.

Barry S.R., Bernal J. 1993. Antimalarial drugs inhibit calcium-dependent backward swimming and calcium currents in Paramecium calkinsi. J Comp Physiol [A]. May;172(4):457-66.

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