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Ronald M. Hansen, Anne B. Fulton; The Course of Maturation of Rod-Mediated Visual Thresholds in Infants. Invest. Ophthalmol. Vis. Sci. 1999;40(8):1883-1886.
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purpose. To measure the developmental course of infants’ rod-mediated
methods. Thresholds for detecting stimuli (2° diameter, 50 msec duration)
presented at 10° (parafoveal site) or 30° (peripheral site) from a
central fixation target were estimated using a preferential-looking
method. Nine infants were tested at both stimulus positions at ages 10,
18, and 26 weeks.
results. At 10 weeks, infants’ thresholds at both sites were significantly
higher than those of adults. The infants’ average threshold at 10°
was 0.5 log unit higher than the infants’ average threshold at 30°.
Adults’ thresholds at the two sites were equal. Thresholds of all
infants decreased with age until by age 26 weeks the parafoveal and
peripheral thresholds were equal and were the same as those of adults.
The rate of change of parafoveal thresholds was significantly faster
than the rate of change of peripheral thresholds.
conclusions. Although postreceptoral factors cannot be ruled out, the results
suggest that developmental increases in rod outer segment length and
rhodopsin density account for most of the threshold changes during
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