The meaning of visual fatigue to the lighting engineer, concerned with the design of a lighting system which enables those working under it to operate at the highest efficiency for the longest time and with the minimum of strain, is discussed. One technique put forward for testing visual fatigue by recording increasing error in a visual test is fully described, and an investigation to determine its suitability as a practical test is described. Reasons for the failure of this method to prove itself practicable are discussed, and the design and construction of an apparatus for studying a more objective method of measurement of fatigue by timing the accommodation process are described.
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J. B. Collins (1959) studied this question.