The View from Above: The Gemini Visual Acuity Experiments

4 Min Read The View from Above: The Gemini Visual Acuity Experiments Astronauts L. Gordon Cooper Jr. and Charles “Pete” Conrad Jr.

(shown here) participated in visual experiments during the Gemini V mission in August 1965. Credits: NASA/L. Gordon Cooper Jr.

NASA astronaut L. Gordon Cooper, Jr. took 29 color photographs of the Earth with a 70mm camera as he orbited our planet during the Mercury-Atlas 9 mission in May 1963.

Cooper’s view from the window of his Faith 7 spacecraft was spectacular, and he reported that he could see vehicles motoring on dirt roads, smoke-belching trains, and the tops of houses. Researchers and members of the public had their doubts. Could Cooper actually see objects on the Earth’s surface in such fine detail while orbiting 100 miles above the planet?

Some vision experts assumed that astronauts with 20/20 vision could not clearly see objects with sides less than 150 feet long at orbital altitudes. -Mexico border as he claimed. Cooper, however, was not alone in his assertions.

Other Mercury astronauts  also reported seeing objects on the Earth in striking detail. During his 22-orbit Mercury-Atlas 9 spaceflight in May 1963, L. Gordon Cooper Jr.

took photos from the Faith 7 spacecraft including this one showing lakes in Western Tibet. NASA These claims caused mental health professionals to question the sanity of NASA’s first astronauts. ” While mental health experts considered the effects of space flight on the brain, visual acuity experts mulled over the Mercury astronauts’ assertions and developed an experiment to determine what they could see on Earth from space.

Putting Astronaut Vision to the Test NASA and its partners developed two visual acuity experiments and conducted them during the crewed Gemini V and Gemini VII missions.  The first experiment involved looking through an optical device reminiscent of binoculars. Test subjects looked through the eyepieces to see an assortment of rectangles in various positions and levels of contrast.

  Another part of the experiment involved creating two enormous terrestrial eye charts composed of gigantic white rectangles. The rectangles, created by the Dow Chemical Corporation, ranged in size from roughly 150 to 600 feet long.  This visual acuity tool was nicknamed the “Eye-Q” chart.

In-Flight Vision Testing Instrument Drawing illustrating a Gemini astronaut using the In-Flight Vision Tester. NASA Gemini V Visual Acuity Experiment This illustration shows the intended orientation of the Gemini spacecraft as it orbited over the “Eye-Q” ground observation sites. NASA Cloudy conditions, sunlight scattered by the window of the Gemini spacecraft, and unfavorable orbital orientations during overflight all impacted the astronauts’ views of the ground-based experiments.

Nevertheless, during some orbital revolutions, astronauts on both missions were able to see portions of the ground site near Laredo. Aerial view of the visual acuity experiment’s ground site in Laredo, Texas. NASA Their reports on the Laredo “Eye-Q” site, combined with the results of the binocular-like vision tester experiments conducted before, during, and after the flight, revealed that astronauts could in fact see roads and ships with following wakes from orbit.

The experiments also determined that an astronaut’s vision did not deteriorate during a two-week spaceflight. 1 Astronaut Frank Borman, Gemini VII command pilot, participates in a vision experiment using the in-flight visual acuity device during the two-week mission in December 1965. NASA Implications Determining what features on Earth astronauts could accurately see from orbit was about much more than sanity checking astronaut reports.

Understanding what human eyes could see from space, as well as seeing the photographs taken on NASA’s early crewed missions had huge implications for geologists, geographers, oceanographers, and others studying our planet. The scientific community’s interest in the recollections and photographs of the Earth’s surface as seen by the Mercury and Gemini astronauts motivated NASA and its partners to advocate for new Earth-observing instruments. S.

S. Department of Agriculture noted that surface images of the Earth captured from above could be used to inventory crops, map geological features, monitor natural disasters, and better understand the ocean’s processes. This photograph of the San Francisco Bay area of California was taken as part of the Skylab Earth Resources Experiment Package in January 1974.

NASA The promise of these real-world applications motivated the creation of the Earth Resources Technology Satellite (ERTS), later renamed Landsat 1. Launched by NASA in 1972, the data from Landsat 1’s camera and multi-spectral scanner were used along with data from the agency’s Earth Resources Aircraft Program to monitor the oceans, agricultural fields, natural disaster sites, and more. In the six decades since America’s first pioneering human spaceflights, NASA has continued to observe the Earth from orbit, aircraft, and even ground level in a continuing quest to help solve problems here on Earth.

Note [1] In subsequent years, scientists have documented that roughly 70% of astronauts experience Spaceflight Associated Neuro-ocular Syndrome (SANS) during longer spaceflights.