It’s common knowledge that the pupils of your eyes dilate in darkness—to absorb as much light as is available—while they contract in bright light so as not to overwhelm the system. Pupils also dilate in response to various stressors, including the muscle activity involved in clenching your teeth. These eye responses are regulated by branches of the autonomous (also called the autonomic) nervous system (ANS).
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Eye Study Suggests Autonomic Nervous System Dysfunction in TMD
