This report reviews and evaluates the research and observations pertaining to the effects upon human vision of unusual gravitational force, which will be encountered in space flight operations. Increased g and null gravity are the major topics of discussion. Within each topic the gross and qualitative changes in vision are discussed first. Quantitative and analytic studies are next reviewed, ranging from the application of the threshold methods of psychophysics to the performance of flying tasks such as dial reading. Operational experience of the astronauts is included. Techniques for ameliorating the undesirable effects of acceleration and null gravity are summarized.
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