NASA conducted in-flight visual acuity experiments during the Gemini V and Gemini VII missions to test astronaut vision from space.

Key Details

• Astronauts used a binocular-like In-Flight Vision Tester to identify rectangle orientations
• Terrestrial 'Eye-Q' charts with white rectangles ranging from 150 to 600 feet were placed in Laredo, Texas, and Carnarvon, Australia
• Experiments confirmed astronauts could see surface features like roads and ship wakes from orbit without vision degradation

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