Science biology, anatomy, BCU iris contracting on reaction to light, BCU controlling muscles of iris MCU iris muscles, under spot light 04:16,50 iris reacting to light experiment 04:17,33 Cross section of eye under slit light, cornea, through which pupil lens is visible, aqueous humour, cross section of shut down iris in strong light 04:23:10 tear forming and rolling down lower eyelid more slit light

Filmed by David Spears

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