The H-R-R Polychromatic Plates

Hardy, LeGrand H.

doi:10.1001/archopht.1954.00920040218009

Cited by 30 publications

(1 citation statement)

References 6 publications

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“…Subjects 1 and 3 were female and subjects 2, 4, and 5 were male. All subjects had normal vision correctable to at least 20/20 and normal color vision as assessed by the Hardy-Rand-Rittler 4 th edition pseudoisochromatic plates (Richmond Products, 2002; Hardy et al, 1954, Croner, 1961). The research followed the tenets of the Declaration of Helsinki and all subjects gave informed consent after an explanation of the study procedure and any possible risks.…”

Section: Methodsmentioning

confidence: 99%

Adaptive optics without altering visual perception

2014

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Adaptive optics combined with visual psychophysics creates the potential to study the relationship between visual function and the retina at the cellular scale. This potential is hampered, however, by visual interference from the wavefront-sensing beacon used during correction. For example, we have previously shown that even a dim, visible beacon can alter stimulus perception (Hofer, H. J., Blaschke, J., Patolia, J., & Koenig, D. E. (2012). Fixation light hue bias revisited: Implications for using adaptive optics to study color vision. Vision Research, 56, 49-56). Here we describe a simple strategy employing a longer wavelength (980nm) beacon that, in conjunction with appropriate restriction on timing and placement, allowed us to perform psychophysics when dark adapted without altering visual perception. The method was verified by comparing detection and color appearance of foveally presented small spot stimuli with and without the wavefront beacon present in 5 subjects. As an important caution, we found that significant perceptual interference can occur even with a subliminal beacon when additional measures are not taken to limit exposure. Consequently, the lack of perceptual interference should be verified for a given system, and not assumed based on invisibility of the beacon.

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Section: Methodsmentioning

confidence: 99%