NASA this spring plans to introduce its first systematic study of the vision problems that surfaced two years ago as an unanticipated ailment among some astronauts assigned to long-duration missions aboard the International Space Station. The Ocular Health investigation, which will use tonometry to gather regular measurements of intraocular pressures from astronauts, ultrasound scans of their eyes and intracranial physiology, is scheduled to begin with ISS Expedition 35 in late March. It ...

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