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III Oculomotor nerve. Fibers run from the mid-brain to the eye. Supplies motor fibers to four of the six muscles that direct the eyeball, to the eyelid, and to the internal eye muscles controlling lens shape and pupil size.
The iris is a muscle that controls the size of the pupil and therefore, the amount of light that enters the eye. Also, the color of your eyes is determined by the iris. The vitreous or vitreous humor is a clear gel that provides constant pressure to maintain the shape of the eye. Iris: Circular band of muscles that controls the size of the pupil. 2  The pigmentation of the iris gives color to the eye. 3  Blue eyes have the least amount of pigment; brown eyes have the most. 4  Lens: Transparent tissue that bends light passing through the eye. 5  To focus light, the lens can change shape by bending.