March 1994
Volume 35, Issue 3
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Articles  |   March 1994
Scotopic optokinetic nystagmus thresholds in 10-week-old infants.
Author Affiliations
  • R M Hansen
    Department of Ophthalmology, Children's Hospital, Boston, MA 02115.
  • A B Fulton
    Department of Ophthalmology, Children's Hospital, Boston, MA 02115.
Investigative Ophthalmology & Visual Science March 1994, Vol.35, 1246-1249. doi:
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      R M Hansen, A B Fulton; Scotopic optokinetic nystagmus thresholds in 10-week-old infants.. Invest. Ophthalmol. Vis. Sci. 1994;35(3):1246-1249.

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

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Abstract

PURPOSE: To compare psychophysical and reflexive optokinetic nystagmus (OKN) estimates of dark-adapted scotopic thresholds mediated by the posterior retina in 10-week-old infants and adults. METHODS: A staircase procedure was used to determine the stimulus intensity needed to produce an OKN response to a moving 19 degrees x 19 degrees grating. In the same subjects, a two-alternative, forced-choice procedure was used to obtain thresholds for detecting 10 degrees diameter, 50 ms duration stimuli. RESULTS: Both OKN and psychophysical thresholds of infants are 0.9 log unit higher than those of adults. CONCLUSION: The infant-adult difference in thresholds mediated by retina at the posterior pole is greater than the infant-adult difference in thresholds for full-field stimuli. It is possible that delayed maturation of the posterior retina is the primary determinant of infants' high OKN and psychophysical thresholds.

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