![]() Predictive positive and negative values of a threshold value of HFVI in assessing pain have been studied. The CS of the newborn infant was 2.0 (contrast threshold = 0.497 95% confidence interval: 0.475–0.524) for vertically oriented gratings and 1.74 (threshold = 0.575 95% confidence interval: 0.523–0.633) for horizontally oriented gratings (P =5. One experienced and one novice adult observer tested the infants using vertical square-wave gratings (0.06 and 0.10 cyc/deg 20/10,000 and 20/6000 nominal Snellen equivalent) the experienced observer also tested using horizontal gratings (0.10 cyc/deg) and using the Method of Constant Stimuli while being kept unaware of the stimulus values. The CS of 119 healthy newborn infants was measured using stimuli printed on cards under the descending method of limits (93 infants) and randomized/masked designs (26 infants). ![]() ![]() To measure the binocular contrast sensitivity (CS) of newborn infants using a fixation-and-following card procedure. ![]() The Contrast Sensitivity of the Newborn Human Infantīrown, Angela M. ![]()
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