Two pupils, one light.
Why does light in one eye change both pupils?
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Why does light in one eye change both pupils?
Fit the specimen and set conditions before running.
The retinal signal reaches both motor limbs of the reflex. Circular iris muscles constrict the apertures; a motor interruption affects only its own side.
Schematic bilateral reflex, 2–7 mm illustrative apertures. The relay represents the brainstem reflex pathway. No diagnostic interpretation.
Constrict both pupils with light entering one eye.
Constrict both pupils with light entering one eye.