title: Hypoxia, color vision deficiencies, and blood oxygen saturation.
abstract: Chromatic thresholds were measured using the Cambridge Colour Test (CCT), the Colour Assessment and Diagnosis (CAD) test, and the Cone Specific Contrast Test (CSCT) at ground and 3780 m (12,400 ft) for subjects with normal color vision and red-green color vision defects. The CAD revealed a small (~10%) increase in the red-green thresholds for the trichromatic subjects and a similar increase in the blue-yellow thresholds for the dichromats. The other two color vision tests did not reveal any significant change in chromatic thresholds. The CAD results for the trichromats were consistent with a rotation of the discrimination ellipse counterclockwise with little change in the elliptical area. This alteration in the color discrimination ellipse can occur when retinal illumination is lowered.
authors.affiliation: School of Optometry, University of Waterloo, Waterloo, Ontario N2L 2G1 Canada. jhovis@uwaterloo.ca
authors.forename: Jeffery K
authors.initials: JK
authors.lastname: Hovis
authors.forename: Nelda J
authors.initials: NJ
authors.lastname: Milburn
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Nesthus
mesh_terms: D000293:Adolescent; D000328:Adult; D003118:Color Perception; D003117:Color Vision Defects / Q000097:blood* / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D000860:Hypoxia / Q000150:complications; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood*; D012684:Sensory Thresholds; D014787:Vision Tests; D055815:Young Adult
chemical_list: D010100:Oxygen