November 15, 2011
How Does Space Flight Impact Astronauts’ Eyes And Vision
North American Neuro-Ophthalmology Society (NANOS) member describes novel eye findings in astronauts after long duration space flight
A newly published ophthalmologic study recently described the history, clinical findings, and possible etiologies of novel ophthalmic findings discovered in astronauts after long-duration space flights. The study team included ophthalmologists Thomas H. Mader, MD, of Alaska Native Medical Center and neuro-ophthalmologist and NANOS member, Andrew G. Lee, MD, Professor and Chair of the Department of Ophthalmology of The Methodist Hospital, Houston, Texas. The report is published in October's Ophthalmology, the journal of the American Academy of Ophthalmology.
The 300 post-flight questionnaires documented that approximately 29% and 60% of astronauts on short and long-duration missions, respectively, experienced a worsening of distance or near visual acuity. Some of these vision changes remain unresolved years after flight. The authors theorized that changes may have resulted from fluid shifts brought about by prolonged exposure to low gravity. The findings might represent parts of a spectrum of ocular and brain responses to extended exposure to low gravity. Future research is ongoing for astronauts entering new missions.
References: Mader TH, Gibson CR, Pass AF, Kramer LA, Lee AG, Fogarty J, et al. Optic Disc Edema, Globe Flattening, Choroidal Folds, and Hyperopic Shifts Observed in Astronauts after Long-duration Space Flight. Ophthalmology 118(10):2058-2069 October 2011.
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