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  • E Pulos
  • Investigative ophthalmology & visual science
  • 1989
Absolute thresholds of 23 subjects 19-61 years of age were determined for three wavelengths at six retinal eccentricities in the horizontal meridian (2.5 degrees-30 degrees). The raw data were corrected for prereceptoral light losses that may be age-dependent. Lens density was estimated for each subject by comparing scotopic spectral sensitivity with the(More)
Recent evidence has shown that 1- and 2-month-old infants localize a peripheral target by means of a series of saccades. Step size in a series was directly related to target distance, but within a localizing series did not vary appreciably as the line of sight approached the target. The current study examined whether, during localization of a peripheral(More)
Photopic background stimulation elevates scotopic increment thresholds (rod-cone interaction) at moderate background levels when both test and concentric disk-background stimuli enter the same eye (monocular condition) but not when they enter different eyes (dichoptic condition). Only when background levels are made extremely high is there any measurable(More)
The intensity-response function of the scotopic b-wave of the electroretinogram may be a useful device for monitoring patients with retinal disease. Three models were evaluated that describe this function in 152 patients with diabetic retinopathy of varying severity and in 40 nondiabetic comparison subjects. The models considered were the Naka-Rushton(More)
The effects of abrupt increases and decreases of light in one part of the retina on sensitivity in an adjacent part of the retina were studied under low scotopic conditions near absolute threshold. The basic finding is that a brief annular surround decreases sensitivity to test spots occurring near the time of its onset or its offset, but that the surround(More)
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