The contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina.
A flower of any of the species belonging to the genus Iris; the flowers occur in many colours, have long and slender pointed leaves, and either a corm or a rhizome.
muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
thin overlapping plates can be adjusted to change the diameter of a central opening
diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye
