Microgravity significantly affects ocular anatomy, with current theories focusing on pressure changes within and around  the optic nerve as well as blood drainage in the retina and choroidal blood  layer. A novel imaging technique called optical coherence tomography angiography (OCTA) has recently been demonstrated to detect microvascular  changes in the retina and choroid. To date, no OCTA-derived ocular imaging  results have been published from microgravity studies. This experiment seeks to improve our understanding of the choroidal and retinal vascular architecture using OCTA, thereby enhancing our knowledge of ocular  physiological changes in space. This is one of the clinical studies conducted on the Ax-1 crew.

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