A number of ocular findings can be found in astronauts, especially after long space flights. The cause of the Space Flight-Associated Neuro-Ocular Syndrome (SANS) is a subject of ongoing research.
Theories: increased intracranial pressure; cephalad fluid shift
(1) reduced visual acuity
(2) change in refraction, which may be temporary
Findings associated with SANS:
(1) unilateral or bilateral optic disc edema
(2) globe flattening
(3) choroidal and retinal folds
(4) hyperopic refractive error shifts
(5) cotton wool spots (nerve fiber layer infarcts)
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