What is Eye Stroke? Anterior Ischemic Optic Neuropathy (AION) occurs when there is insufficient blood supply to the optic nerve, resulting in loss of vision. There are two types of AION: Nonarteritic Anterior Ischemic Optic Neuropathy (NAION) and Arteritic Anterior Ischemic Optic Neuropathy (AAION).
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For those flights, two sets of EVA astronauts would venture out of the orbiter, thus requiring NASA to fly four sets of suits (along with repair parts). 41 EVAs using EMUs had been conducted out of the Space Shuttle airlock prior to the start of ISS assembly in November 1998.