In human anatomy, the iris is the colored, muscular part of the eye surrounding the pupil. The iris is in front of the lens and behind the cornea and is bathed in front and behind by a fluid known as the aqueous humor.
1.the contractile, circular diaphragm forming the colored portion of the eye and containing an opening, the pupil, in its center. 2.any plant of the genusIris,having flowers with three upright petals and three drooping, petallike sepals. ...
Cornea (shown here as light blue area to the left of the iris) The cornea is the transparent structure located in the front of the eye, covering the iris, pupil, and anterior chamber. About 40 of the eye's 60 diopters are present in the cornea. The cornea is supplied with oxygen and...
Wondering how the human eye works? Read this article to learn all about the complete makeup of the eye, including the cornea, retina, macula and pupil.
The avian eye is both relatively and absolutely large relative to its body size. The sclera is invested with a ring of small bones anteriorly and cartilage posteriorly. All birds have some degree of striated muscle in their iris making the use of parasympatholytic agents (eg atropine) ...
eye 1.the organ of sight of animals, containing light-sensitive cells associated with nerve fibres, so that light entering the eye is converted to nervous impulses that reach the brain. In man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses ...
In a number of ways, the human eye works much like a digital camera: Light is focused primarily by the cornea – the clear front surface of the eye, which acts like a camera lens. Theiris(colored part) of the eye functions like the diaphragm of a camera, controlling the amount of lig...
The iris controls the size of the pupil by expanding and contracting, and the pupil lets light through to the lens and interior portions of the eye. The sclera is the white part of the eye, which gives it shape and contains blood vessels that supply oxygen. The conjunctiva is a ...
Das obere Augenlid sollte leicht über die Iris, aber es sollte nicht die Schüler in geöffnetem zu decken; das untere Lid liegt unterhalb der Iris. Der Sklera erscheint normalerweise weiß oder etwas in der Farbe Buff. Das Aussehen der Bindehaut, eine transparente Membran, die die ...
The pupil is the hole at the centre of the iris located in front of the lens. Whenever more light needs to enter the eyeball, the muscles in the iris contract like the diaphragm of a camera to increase or decrease the size of the pupil. Lens The lens is a biconvex, transparent disc...