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THE HUMAN EYE IN SPACEHuman visual hardware is a result of a billion years of evolution withinthe earths atmosphere where light is scattered by molecules of airmoisture particular matter etc However as we ascend into our atmospherewith decrease density light distribution is changed resulting in our visualhardware receiving visual data in different format Some Aspects to Consider1 Visual acuity is the degree to which the details and contours of objects are perceived Visual acuity is usually defined in terms of minimum separableLarge variety of factors influence this complex phenomenon which includes Optical factors- state of the image forming mechanisms of the eye Retinal factors such as the state of the cones Stimulus factors such as illumination brightness of the stimulus contrast between the stimulus and background length of time exposed to the stimulus Minimum separable shortest distance by which two lines can be separated and still be perceived as two lines During the day the earth has a predominantly bluish cast I could detect individual houses and streets in the low humidity and cloudless areas such as the Himalaya mountain area I saw a steam locomotive by seeing the smoke first I also saw the wake of a boat on a large river in the Burma-India area and a bright orange light from the British oil refinery to the south of the city PerthAustraliaThe above observation was made by Gordon Cooper in Faith 7 1963 and whichgenerated much skepticism in the light of the thesis by Muckler and NarvanVisual Surveillance and Reconnaissance from space vehicles in which theydetermined that a visual angle of ten minutes was the operational minimumand that the minimum resolvable object length MROL at an altitude of113 miles would be 1730 ft This limitation of acuity was revised the nextyear to 05 seconds of arc for
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