'Listen up, students--the amount of light entering the eye is controlled by this dilating & contracting part'
the pupil
YOUR EYE: Listen up, students--the amount of light entering the eye is controlled by this dilating & contracting part
Listen up, students--the amount of light entering the eye is controlled by this dilating & contracting part
Listen up, students--the amount of light entering the eye is controlled by this dilating & contracting part
YOUR EYE
the pupil
YOUR EYE