English

Visual acuity and visibility, experiments S008 and D013

Data from the inflight vision tester showed that no change was detected in the visual performance of any of the four crewmembers of the Gemini 5 and 7 missions. Results from observations of the side near Laredo, Texas, confirmed that the visual performance of the crewmen during space flight was within the statistical range of their preflight visual performance. The results also demonstrated that visual data collected in the laboratory can be combined with environmental optical data to predict correctly the limiting visual capability of humans to discriminate small objects on the surface of the earth in daylight.

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