Almost, but not quite, down to the visual threshold.
2.
He made contributions to the knowledge of dark adaptation, visual acuity, brightness discrimination, color vision, and the mechanism of the visual threshold.
3.
Night vision systems enabled the measurement of visual thresholds following World War II . The 1950s also marked a time of notable development in the performance modeling of night vision imaging systems.
4.
In addition, the eye and the visual system can be routinely and easily monitored for visual function and retinal structural changes after injections with noninvasive advanced technology, such as visual acuities, contrast sensitivity, fundus auto-fluorescence ( FAF ), dark-adapted visual thresholds, vascular diameters, pupillometry, electroretinography ( ERG ), multifocal ERG and optical coherence tomography ( OCT ).
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