Your eyeball refer to the who eye with the organs attached, but when you say eye your refering to just the eye like when you say "there's something in my eye", well it pretty much just sounds better say eye instead of eyeball.
The iris, specifically the muscles within it, control the size of the pupil. Contraction and relaxation of these muscles regulate the amount of light entering the eye by adjusting the diameter of the pupil.
iris, which is the colored part of the eye surrounding the pupil.
The colored muscular diaphragms that surround the pupil are called the iris. They control the size of the pupil to regulate the amount of light entering the eye.
When the radial muscles of the iris contract, the pupil dilates or becomes larger.
They are hollow so light can pass through to the retina, so you can see. The pupil is the opening in the iris. To ask why the eyes' pupils are hollow is analogous to asking why a donut hole is hollow.
it is known as Iris. contraction or relaxation of iris alters the size of pupil.
The pupil is allways black. The iris is the colored part.
The iris, specifically the muscles within it, control the size of the pupil. Contraction and relaxation of these muscles regulate the amount of light entering the eye by adjusting the diameter of the pupil.
Not the pupil itself but the SIZE of it as controlled by the eye's Iris does this, it acts in a way similar to a camera's F stop iris.
iris, which is the colored part of the eye surrounding the pupil.
The black circle in the middle of the iris in your eye is called a pupil. It dilates to adjust with sunlight.
It's called the iris.
In the book his eyes are incredibly dark. You almost can't distinguish between his pupil and iris. In the TV series he is played by Ian Somerhalder who has blue eyes
No. The pupil can only open to the size of the iris.
The opening that is controlled by the muscles of the iris is called the pupil. The iris is responsible for adjusting the size of the pupil in response to different lighting conditions.
White pupil, black iris, red sclera Check out the related link for a picture.
Both of these are ways to identify a person. An iris recognition looks at eyes and finger prints look at fingers.