In order for a pilot to operate any type of aircraft safely and efficiently, his combined visual elements must function in a manner to insure full visual efficiency without undue nervous or muscular stress. He must be able to regain his senses of equilibrium and position quickly when these are confused after rapid gyrations and while he is in positions to which his body is not accustomed.
In the early days of aviation it was thought that a person in order to fly aircraft must possess a mental and physical equipment that functioned in a peculiarly superefficient manner and that only certain persons possessed such equipments. Later, however, it was found that any person mentally and physically normal could learn to fly more or less successfully. Considering, however, the flying equipment and the general knowledge of aviation, the early flier must have possessed a special brand of psychology
THORNE FH. OPHTHALMOLOGY IN AVIATION. Arch Ophthalmol. 1938;19(2):253–277. doi:10.1001/archopht.1938.00850140095012
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