Experimental Brain Research

, Volume 10, Issue 4, pp 380–388

Stereopsis and stereoblindness

  • Whitman Richards


Psychophysical tests reveal three classes of wide-field disparity detectors in man, responding respectively to crossed (near), uncrossed (far), and zero disparities. The probability of lacking one of these classes of detectors is about 30% which means that 2.7% of the population possess no wide-field stereopsis in one hemisphere. This small percentage corresponds to the probability of squint among adults, suggesting that fusional mechanisms might be disrupted when stereopsis is absent in one hemisphere.

Key Words

Stereopsis Squint Depth perception Visual perception 


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Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • Whitman Richards
    • 1
  1. 1.Department of PsychologyMassachusetts Institute of TechnologyCambridgeUSA

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