Diagram of the Structure of the Human Eye.
Term Definition / Description
Aqueous Humor The aqueous humor is a jelly-like substance located in the anterior chamber of the eye.
Choroid The choroid layer is located behind the retina and absorbs unused radiation.
Ciliary Muscle The ciliary muscle is a ring-shaped muscle attached to the iris.
It is important becausecontraction and relaxation of the ciliary muscle controls the shape of the lens.
Cornea The cornea is a strong clear bulge located at the front of the eye (where it replaces the sclera - that forms the outside surface of the rest of the eye).
The front surface of the adult cornea has a radius of approximately 8mm.
The cornea contributes to the image-forming process by refractinglight entering the eye.
Fovea The fovea is a small depression (approx. 1.5 mm in diameter) in the retina.
This is the part of the retina in which high-resolution vision of fine detail is possible.
Hyaloids The hyaloids diaphragm divides the aqueous humor from the vitreous humor.
Iris The iris is a diaphragm of variable size whose function is to adjust the size of the pupilto regulate the amount of light admitted into the eye.
The iris is the colored part of the eye (illustrated in blue above but in nature may be any of many shades of blue, green, brown, hazel, or grey).
Lens The lens of the eye is a flexible unit that consists of layers of tissue enclosed in a tough capsule. It is suspended from the ciliary muscles by the zonule fibers.
Theoptic nerve is the second cranial nerve and is responsible for vision.
Each nerve contains approx. one million fibers transmitting information from the rod and cone cells of the retina.
Papilla The papilla is also known as the "blind spot" and is located at the position from which the optic nerve leaves the retina.
Pupil The pupil is the aperture through which light - and hence theimages we "see" and "perceive" - enters the eye. This is formed by the iris. As the size of the iris increases (or decreases) the size of the pupil decreases (or increases) correspondingly.
Retina The retina may be described as the "screen" on which an image is formed by light that has passed into the eye via the cornea, aqueous humor, pupil, lens, then the hyaloids and finally the vitreous humorbefore reaching the retina.
The retina contains photosensitive elements that convert the light they detect into nerve impulses that are then sent onto the brain along the optic nerve.
Sclera The sclera is a tough white sheath around the outside of the eye-ball.
This is the part of the eye that is referred to by the colloquial terms "white of the eye".
Visual AxisA simple definition of the "visual axis" is "a straight line that passes through both the centre of the pupil and the centre of the fovea". However, there is also a stricter definition (in terms of nodal points) which is important for specialists in optics and related subjects.
Vitreous Humor The vitreous humor (also known as the "vitreous body") is a jelly-like substance.Zonules The Zonules (or "zonule fibers") attach the lens to the ciliary muscles.
The ocular globe from Latarjet
The ocular globe has a spherical form smoothed in anteroposterior sense. This form is considerer regular, but also exist a salient that made up the transparent cornea. The ocular globe have to characters: is symmetrical and is lined on the third, frontal partsof the orbit. In the eye are described two poles, an Ecuador and many meridians:
• The anterior pole is transparent and correspond with the center of transparent cornea
• The posterior pole is opposite to the one that fits the sclera, is ubicated laterally to enter orifice of the optical nerve, and the axis of the eye is an imaginary line that unit both poles.
• The Ecuador: is the mayor...
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