Experiments on visual acuity and the visibility of markings on the ground in long-duration earth-orbital space flight. NASA CR-1134.
D003626:Data Display; D006804:Ergonomics; D006801:Humans; D008889:Military Personnel; D013026:Space Flight; D014787:Vision Tests; D014785:Vision, Ocular; D014792:Visual Acuity; D014794:Visual Fields; D014796:Visual Perception