見張り作業と視機能について

概要

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This report is the results of a study on the visual sense for the navigator on watch-keeping at sea concerning the following points : 1. Asthenopia of the navigator on watch-keeping. 2. Affection caused by sunglitter (the glittering sea surface by sunlight) to the visual sense. 3. Affection of low illuminance (under 20 lx) at night on dark adaptation. The results obtained are as follows ; 1. On asthenopia (1) Lookout in the daytime affects asthenopia more strongly than at night. (2) Fine weather affects asthenopia more strongly than cloudy or rainy weather. (3) Sailing at harbor or narrow channel affects asthenopia more strongly than at open sea or wide water. (4) It needs about 4 or 5 minutes rest for the navigator's eyes on watch to recover from asthenopia. 2. On affection caused by sunglitter (1) Maximum luminance value is shown when the sun altitude is about 20 degrees. (2) The continuous close observation of a target makes the visual sense fall down. It is like light symptoms of cataract, therefore the navigator should avoid continuous close observation of a target. 3. On dark adaptation When the eyes adapted to the dark are exposed to low illuminance (under 20 lx), it needs about twice as much interval of exposed time to recover visual sense as it does in the previous condition.
社団法人日本航海学会の論文
1992-03-25