Mesopic vision (-2 to 1 log cd/m2 ), where rods and cones are responsive simultaneously, lies between rod-driven scotopic and cone-driven photopic vision. Due to the technical and psychophysiological challenges of assessing mesopic vision, the visual system is not well quantified over the mesopic luminance range. Mesopic vision combined with hypoxia is of particular interest in applications where Army aviators must rely on color-coded visual information displayed under mesopic conditions at altitude. Results are presented from three vision tests (the Lanthony Desaturated-15, the Cone Contrast Test, and the Color Assessment and Diagnosis system) demonstrating that normobaric hypoxia (12% oxygen, approximating 14,000 feet) disrupts mesopic color vision; but not all tests were equally sensitive to this phenomena. Additionally, respiratory data showed that Army aviators increased their tidal volume under normobaric hypoxia, thus respiratory rate assessments alone are insufficient for assessing physiologic adaptation to hypoxia. Under mesopic hypoxia conditions, the known high oxygen demand of rods may reduce the retinal oxygen available for cones thereby diminishing color sensitivity as well as other cone functions. Color vision under mesopic conditions warrants further examination, with particular attention to hypoxia as an important confound in high-terrain, aviation, and aerospace applications.
Leonard A. Temme, Paul St. Onge, and Kevin O'Brien, "Color vision in the twilight zone: an unsolved problem," Proc. SPIE 10197, Degraded Environments: Sensing, Processing, and Display 2017, 1019702 (Presented at SPIE Defense + Security: April 11, 2017; Published: 5 May 2017); https://doi.org/10.1117/12.2262145.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.