Summary
This thesis evaluates how colour vision deficiencies (deuteranopia, protanopia) affect performance on safety-critical visual tasks in professional environments, comparing multiple diagnostic tests across 519 subjects. Findings have direct implications for lighting and display design in occupational settings such as air traffic control, suggesting that adjusting display chromaticity parameters could enable colour-deficient observers to perform comparably to normal trichromats.
Key Findings
- 519 subjects tested (141 normal trichromats, 268 deutans, 110 protans) across multiple colour vision tests, revealing inconsistencies in outcomes between standard tests (Ishihara, CAD, Nagel anomaloscope, etc.).
- Chromatic discrimination thresholds of colour-deficient subjects were measurable and related to performance on visual search tasks representative of real-world display use in ATC environments.
- Display parameter adjustments (chromaticity/luminance contrast) were identified under which colour-deficient observers could achieve performance comparable to normal trichromats, suggesting updates to occupational acceptance criteria are warranted.
- Psychophysical luminance pedestal technique revealed variations in chromatic sensitivity across the visual field with implications for understanding lantern test performance discrepancies.
Categories
Eye Health & Vision: Studies directly assess colour vision deficiencies, chromatic sensitivity, and visual performance across occupational contexts including safety-critical environments.
The Science of Light: Investigates spectral discrimination thresholds, retinal physiology underlying chromatic sensitivity, and photoreceptor-level explanations for colour vision differences across the visual field.
Author(s)
JD Hickey
Publication Year
2015
Related Publications
Eye Health & Vision
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Genetic reactivation of cone photoreceptors restores visual responses in retinitis pigmentosa
- Melanopsin and rod–cone photoreceptors play different roles in mediating pupillary light responses during exposure to continuous light in humans
- Characteristic patterns of dendritic remodeling in early-stage glaucoma: evidence from genetically identified retinal ganglion cell types
- Intrinsically photosensitive melanopsin retinal ganglion cell contributions to the pupillary light reflex and circadian rhythm
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice