The effects of acute hypobaric hypoxia, as potentially experienced in high altitude flight, on the detection of low contrast targets within a high dynamic range (DR) of luminance were investigated. The tests were performed after 10 minutes of adaptation to an ambient luminance level of 0.2 lx. Twenty-four individuals were exposed to hypobaric hypoxia at an altitude of 18,000 ft (5,490 m) inside a hypobaric chamber and were asked to identify the darkest one perceived from a grid of progressively less luminous patches. The results were compared with those obtained by the same subjects at sea level. The results indicate a global reduction of the DR perception during hypoxia, with a mean decrease of 0.023 cd/m2 (standard deviation ±0.064), which resulted statistically significant (p < 0.05). No significant correlations with oxygen saturation levels were observed. These findings might have practical applications in the design of cockpit's instruments, especially those dedicated to night-time flight missions at high altitudes.

Dynamic Range of Luminance Perception in Acute Hypobaric Hypoxia / A. Rizzi, A. Plutino, D. Vecchi, A. Giulio Guadagno, M. Lucertini. - In: HIGH ALTITUDE MEDICINE & BIOLOGY. - ISSN 1557-8682. - (2022). [Epub ahead of print] [10.1089/ham.2022.0036]

Dynamic Range of Luminance Perception in Acute Hypobaric Hypoxia

A. Rizzi
Primo
;
A. Plutino
Secondo
;
2022

Abstract

The effects of acute hypobaric hypoxia, as potentially experienced in high altitude flight, on the detection of low contrast targets within a high dynamic range (DR) of luminance were investigated. The tests were performed after 10 minutes of adaptation to an ambient luminance level of 0.2 lx. Twenty-four individuals were exposed to hypobaric hypoxia at an altitude of 18,000 ft (5,490 m) inside a hypobaric chamber and were asked to identify the darkest one perceived from a grid of progressively less luminous patches. The results were compared with those obtained by the same subjects at sea level. The results indicate a global reduction of the DR perception during hypoxia, with a mean decrease of 0.023 cd/m2 (standard deviation ±0.064), which resulted statistically significant (p < 0.05). No significant correlations with oxygen saturation levels were observed. These findings might have practical applications in the design of cockpit's instruments, especially those dedicated to night-time flight missions at high altitudes.
high dynamic range; human visual system; hypoxia
Settore ING-INF/01 - Elettronica
1-ago-2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/935430
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