The colored ring of tissue suspended behind the cornea and immediately in front of the lens It regulates the amount of light entering the eye by adjusting the size of the pupil
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens
Behind the cornea is the colored part of the eye, the iris The color of the iris is a result of the amount of pigment, it contains The iris contracts and expands its dilator muscles, depending on whether you are in bright light or in dim or dark surroundings By regulating the size of the pupil, the opening in the center, the iris directs light onto the retina (Marks 3)
diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
The coloured muscular membrane which lies behind the cornea and in front of the lens which by opening or closing determines the size of the pupil and hence the amount of light entering the eye
An adjustable opto-mechanical aperture built into a camera that controls the amount of lights coming through the lens
A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de- luce (fleur-de-lis), orris, and other species of flag are examples
The contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye
Tissue behind the cornea that gives color to the eye (i e blue eyes) and controls amount of light entering the eye by varying the size of its central opening (pupil)