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Related Concept Videos

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Updated: Apr 29, 2026

Assessment of Global Ocular Structure Following Spaceflight Using a Micro-Computed Tomography Micro-CT Imaging Method
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Microgravity-Induced Ocular Changes Assessed by Optical Coherence Tomography.

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    Summary
    This summary is machine-generated.

    Head-down tilt (HDT) simulates microgravity, causing increased intraocular pressure (IOP) and changes in retinal thickness. These ocular effects from HDT may not fully recover, impacting astronaut visual health.

    Keywords:
    head-down tiltmeta-analysismicrogravityoptical coherence tomographyspaceflight associated neuro-ocular syndrome

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    Area of Science:

    • Ophthalmology
    • Aerospace Medicine
    • Physiology

    Background:

    • Space missions risk astronaut visual health due to fluid shifts.
    • Spaceflight-associated neuro-ocular syndrome (SANS) requires understanding.
    • Head-down tilt (HDT) models microgravity's ocular effects.

    Purpose of the Study:

    • To review how HDT affects ocular parameters measured by optical coherence tomography (OCT).
    • To assess changes in intraocular pressure (IOP) under HDT conditions.
    • To understand the impact of HDT on retinal and choroidal thickness.

    Main Methods:

    • Systematic review of 7 databases through May 2025.
    • Included studies on human subjects undergoing HDT with OCT outcomes.
    • Assessed risk of bias using ROBINS-I v2.

    Main Results:

    • Mild HDT caused moderate IOP elevation and slight retinal thickening.
    • Prolonged HDT led to cumulative retinal thickness and nerve fiber layer increases.
    • Steeper tilts caused rapid IOP rises and choroidal thickness changes; recovery was often incomplete.

    Conclusions:

    • HDT-induced ocular changes confirm cephalad fluid shifts disrupt venous outflow.
    • Findings support HDT as a model for microgravity-induced ocular effects.
    • Standardized methodology and longer follow-up are needed for SANS research.