Abstract
To evaluate the effect of mastication on the autonomic nervous system in the human eye, we investigated pupil diameter and accommodation during the change in fixation from a distant to a near object by using a new dioptric accommodometer and infrared pupillography. The hemoglobin oxygenation state in the ciliary muscle before and after a gum-chewing task was measured by visible spectroscopy. The measurements were performed on 10 healthy volunteers ranging in age from 18 to 24 years. The hemoglobin oxygenation state value in each individual before the gum-chewing task (used as the standard) was set equal to 100%.
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