September 2005
Volume 5, Issue 8
Vision Sciences Society Annual Meeting Abstract  |   September 2005
Two eyes: Twice as good as one?
Author Affiliations
  • William A. Simpson
    DRDC Toronto, 1133 Sheppard Ave W., Toronto, ON M3M 3B9Canada, and Centre for Vision Research, York University, Toronto
  • Velitchko Manahilov
    Vision Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, UK
Journal of Vision September 2005, Vol.5, 798. doi:
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      William A. Simpson, Velitchko Manahilov; Two eyes: Twice as good as one?. Journal of Vision 2005;5(8):798. doi:

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      © ARVO (1962-2015); The Authors (2016-present)

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In a classic experiment on the detection of simple patterns, Campbell & Green (1965) showed that for both humans and an ideal signal detector, two eyes are only √2 better than one eye. If the ideal observer shows only a √2 improvement, then how can binocular simple cells (Ohzawa & Freeman, 1986; Smith, Chino, Ni, & Cheng, 1997) show a doubling in contrast sensitivity when given binocular input? We resolve this puzzle by showing that the ideal observer may differ from the Campbell & Green model, and we find that the binocular improvement for detection increases with spatial frequency to a level well above √2.

Simpson, W. A. Manahilov, V. (2005). Two eyes: Twice as good as one? [Abstract]. Journal of Vision, 5(8):798, 798a,, doi:10.1167/5.8.798. [CrossRef]

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