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Crew Visual Performance (DSO 440)
Principal Investigators
Research Area:
Clinical medicine
Ocular physiological phenomena
Species Studied
Scientific Name: Homo sapiens Species: Human

Since the early days of the Gemini space program there has been an interest in the possible effects of the space environment on visual capability. During the Gemini program S.Q. Duntley headed an effort to determine the effects of space on visual acuity at two different contrast levels. His approach was to develop a portable, compact vision tester to fly aboard the Gemini capsule and compare these results with the astronauts' ability to see similar target patterns constructed on the ground. These methods provided limited visual acuity data on a total of four astronauts. Duntley originally planned to measure a number of visual functions, but due to various limitations only the visual acuity under two contrast conditions was measured. Very little quantitative work on vision in space has been done since that time.

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Visual acuity

Data Information
Data Availability
Archive is complete. No data sets are available for this experiment. Please Contact LSDA if you know of available data for this investigation.

Blackwell disk contrast sensitivity
Contrast thresholds
Critical flicker frequency
Critical fusion frequency
Eye dominance
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
STS-41D 08/30/1984 09/05/1984 6 days
STS-41G 10/05/1984 10/13/1984 8 days
STS-51C 01/24/1985 01/27/1985 3 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Jessica Keune
Institutional Support
National Aeronautics and Space Administration (NASA)