Attenuation of S-cone function at high altitude assessed by electroretinography.

Highlights: [•] We examined the impact of high altitude on blue cone function. [•] Blue cone function was examined objectively using electroretinography. [•] At 4559m an attenuation of blue cone function was observed. [•] Functional impairment was not associated with symptoms of acute mountain sickness. [•] First report of blue cone ERG at high altitude. [ABSTRACT FROM AUTHOR]