August 1983
Volume 24, Issue 8
Articles  |   August 1983
The development of binocular summation in human infants.
Investigative Ophthalmology & Visual Science August 1983, Vol.24, 1103-1107. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      E E Birch, R Held; The development of binocular summation in human infants.. Invest. Ophthalmol. Vis. Sci. 1983;24(8):1103-1107.

      Download citation file:

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

  • Supplements

The difference in pupil diameter between monocular and binocular viewing conditions was used as a measure of binocular luminance summation in 97 infants aged 0 to 12 months. No significant difference in pupil diameter under monocular versus binocular viewing conditions was found until the end of the fourth month of life. The age of onset was positively correlated with the age of onset for stereopsis as assessed by preferential looking. By the end of the 6th month, the difference in pupil diameter under the two viewing conditions was adult-like in magnitude. The procedure provides an objective measure of binocular function that is not affected by fixation error. The data suggest that the visual pathways by which signals from the two eyes converge are not functional until the 4th month of life.


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.