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Induction of Hypoxia in Living Frog and Zebrafish Embryos

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Published on: June 26, 2017

Dynamic changes in ocular and retinal function across acute hypobaric hypoxia.

Xinli Yu¹, Jiaxi Li², Yuchen Wang²

¹School of Biological Science and Medical Engineering, Beihang University, Beijing, China.

Life Sciences in Space Research

|January 21, 2026

Summary

This summary is machine-generated.

High-altitude hypoxia impacts retinal function, specifically the inner retinal layer, and is linked to intraocular pressure. This research explores its relevance to spaceflight visual impairment.

Keywords:

Acute hypoxia ERG Ocular Retinal function

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Area of Science:

Space Medicine
Environmental Physiology
Ophthalmology

Background:

Visual impairment and intracranial pressure (VIIP) syndrome is a significant risk in long-duration spaceflight.
Understanding VIIP mechanisms is crucial, with terrestrial high-altitude hypoxia serving as a relevant analog.
Acute mountain sickness (AMS) shares physiological similarities with spaceflight-induced neurological changes.

Purpose of the Study:

To investigate the effects of acute hypoxic exposure at varying altitudes on ocular parameters.
To explore the relationship between intraocular pressure, refractive status, and retinal function under hypoxia.
To assess the potential of noninvasive ocular measurements as biomarkers for hypoxia-related risks.

Main Methods:

39 healthy participants underwent assessments at sea level and altitudes of 3500m, 4000m, and 4500m.
Measurements included refraction (sphere, cylinder), intraocular pressure (IOP), and electroretinography (ERG).
Statistical analyses, including regression, were used to determine associations between variables.

Main Results:

Hypoxic exposure showed subtle, non-significant changes in refraction and IOP.
Electroretinography revealed reduced amplitude and increased latency, particularly a significant decrease in flicker b-wave amplitude, indicating inner retinal sensitivity.
A significant negative association was found between IOP and flicker b-wave amplitude (β = -0.307, p = 0.031).

Conclusions:

Acute hypoxia affects retinal function and ocular optics, mirroring aspects of VIIP syndrome and AMS.
The inner retinal layer is highly sensitive to hypoxic conditions.
Noninvasive ocular measurements like refraction and ERG show promise as biomarkers for hypoxia-related visual and neurological risks in spaceflight and high-altitude environments.