Pupil Biofeedback: A Window into the LC and ... Stress-related and anxiety disorders often involve heightened arousal states, which can make relaxation and focus challenging.

Normally pupil size fluctuates with changing light ... What is Post-traumatic stress disorder (PTSD)? PTSD is an anxiety disorder caused by very stressful, frightening or distressing events.

Binocular visual acuity, pupil reaction, pupil diameter, and dynamic retinoscopy were recorded before and after instilling guttae cyclopentolate 1%. The accommodative responses were compared with ...