Aim: To investigate changes in colour discrimination as a result of chronic hypoxic exposure induced by extreme altitudes (above 8000 m) during an expedition to Mt Everest.
Methods: Colour discrimination thresholds for tritan, protan and deutan axes were measured extensively in two male participants (four eyes) during an expedition to Mt Everest, using a quantitative, computer controlled psychophysical colour vision test (modified version of the Cambridge Colour Test). The tests were carried out over a period of 54 days at altitudes of 1300 m, 3450 m, 4410 m, 5060 m, 5300 m, 6450 m, 7200 m and 8000 m.
Results: Colour vision tests 1 week before and 6 months after the expedition indicated normal colour discrimination in both participants. With increasing altitude, colour discrimination thresholds were found to rise, predominantly for the tritan (blue) axes in both observers. Deutan (green) thresholds were minimally elevated at high altitude, whereas protan (red) was altered in one observer. Tritan colour discrimination thresholds decreased as a function of time spent at a given altitude and normalised upon return to low altitude.
Conclusions: Chronic hypoxia induced by high altitude exposure transiently affects colour discrimination, in particular tritan axis discrimination. Decreased tritan discrimination is partly reversible upon physiological adaptation to high altitude and completely normalised upon return to low altitude.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1136/bjo.2009.178491 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Kinetics Difference-driven Organophosphorus Hydrolase-like Nanozyme-Coded Pattern for Identifying -Nitrophenyl Pesticides.
Anal Chem
January 2025
School of Public Health, Hengyang Medical School, University of South China, Hengyang 421001, P. R. China.
Organophosphorus pesticides (OPs) are widely used in agricultural production, posing a great threat to human health and the environment. Given that different OPs present different toxicology and toxicities, identifying individual pesticide residues becomes important for assessing food safety and environmental implications. In this work, a kinetics difference-driven analyte hydrolysis strategy is proposed for the first time and validated to identify -nitrophenyl pesticides by developing an organophosphorus hydrolase-like nanozyme-coded sensor array.
View Article and Find Full Text PDFCRISPR-associated Plasmonic Colorimeter Method (Ca-PCM): A real-time RGB detection system for gold nanoparticles-based nucleic acid biosensors.
Anal Chim Acta
February 2025
Fundación IMDEA Nanociencia, Madrid, Spain; Division of Hematopoietic Innovative Therapies, Innovative Therapies Unit. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040, Madrid, Spain; Advanced Therapies Unit, Instituto de Investigación Sanitaria Fundación Jiménez Díaz (IIS-FJD, UAM), 28040, Madrid, Spain. Electronic address:
Background: The detection of genetic sequences represents the gold standard procedure for species discrimination, genetic characterisation of tumours, and identification of pathogens. The development of new molecular detection methods, accessible and cost effective, is of great relevance. Biosensors based on plasmonic nanoparticles, such as gold nanoparticles (AuNPs), provide a powerful and versatile platform for highly sensitive, economic, user-friendly and label-free sensing.
View Article and Find Full Text PDFAs Time Goes By: Event File Decay Does Not Unleash Inhibition of Return.
J Cogn
January 2025
University of Trier, Department of Cognitive Psychology, Germany.
Inhibition of return (IOR) refers to a location repetition cost typically observed when signaling the detection of or localizing sequentially presented stimuli repeating or changing their location. In discrimination tasks, however, IOR is often reduced or even absent; here, effects of binding and retrieval are thought to take place. Information is bound into an event file, which upon feature repetition causes retrieval, leading to partial repetition costs.
View Article and Find Full Text PDFDeep learning helps discriminate between autoimmune hepatitis and primary biliary cholangitis.
JHEP Rep
February 2025
Else Kroener Fresenius Center for Digital Health, Medical Faculty Carl Gustav Carus, Technical University Dresden, Dresden, Germany.
Background & Aims: Biliary abnormalities in autoimmune hepatitis (AIH) and interface hepatitis in primary biliary cholangitis (PBC) occur frequently, and misinterpretation may lead to therapeutic mistakes with a negative impact on patients. This study investigates the use of a deep learning (DL)-based pipeline for the diagnosis of AIH and PBC to aid differential diagnosis.
Methods: We conducted a multicenter study across six European referral centers, and built a library of digitized liver biopsy slides dating from 1997 to 2023.
An ingenious integrated metal-organic frameworks-based ratiometric sensing platform for efficient, sensitive and real-time detection of tetracyclines.
Food Chem
January 2025
School of Public Health, Zhengzhou University, Zhengzhou 450001, PR China. Electronic address:
Herein, we report a novel ratiometric nanoprobe (CDs@LZIF-8-Eu) that integrates fluorescent carbon dots (CDs) and Eu on LZIF-8 via a one-pot stirring method. Tetracyclines (TCs) can create inner filter effect on CDs while simultaneously generating an antenna effect with Eu. The rapid and efficient adsorption capabilities of LZIF-8 enhance the probability of TCs interacting with the signal tags.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!