Although changes to visual acuity in spaceflight have been observed in some astronauts
since the early days of the space program, the impact to the crew was considered minor …

PURPOSE: To describe the history, clinical findings, and possible etiologies of ophthalmic
findings discovered in 7 astronauts after long-duration space flight, and document vision …

For many years, there have been anecdotal reports of vision changes by astronauts
following short and long-duration spaceflight. Much of this was attributed to hyperopic shifts …

Background: To describe the history, clinical findings, and possible pathogenic etiologies of
the constellation of neuro-ophthalmic findings discovered in astronauts after long-duration …

Ocular structural and functional changes, including optic disk edema and reduction of near
visual acuity, have been recently described in some astronauts returning from long-duration …

Key Points Astronauts have recently been discovered to have impaired vision, with a
presentation that resembles syndromes of elevated intracranial pressure on Earth. Gravity …

On Earth, tissue weight generates compressive forces that press on body structures and act
on the walls of vessels throughout the body. In microgravity, tissues no longer have weight …

Background: A number of ophthalmic findings including optic disc edema, globe flattening,
and choroidal folds have been observed in several astronauts after long-duration space …

Zhang LF, Hargens AR. Intraocular/intracranial pressure mismatch hypothesis for visual
impairment syndrome in space. Aviat Space Environ Med 2014; 85: 78–80. Visual …

Intraocular pressure (IOP) initially increases when an individual enters microgravity
compared with baseline values when an individual is in a seated position. This has been …