Structure of the Human Eye

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término		definición
sclera empezar lección		The white part of the eye that surround the eyeball and helps maintain it's shape. It has tiny blood vessels
Cornea empezar lección		A transparent lens covering the eye
lacrimal glands empezar lección		the gland that produces tears and located in the backside of the upper eye
Iris empezar lección		Ether blue or brown- made up of cirucular muscles used to make the pupil smaller in bright light and larger in dim light
Pupil empezar lección		Dark circular opening in the center of the iris
ciliary muscles empezar lección		a ring of delicate fibers used the hold the lens in place
aqueous humor empezar lección		behind the cornea
Lens empezar lección		behind the iris, a clear convex disk that helps the cornea focus light coming into the eye
vitreous humor empezar lección		clear jelly like sphere that holds the internal structure of the eye in place and maintains the shape of the eye
Retina empezar lección		a translucent layer of tissue in the back of the eye, forms images and sends to the brain for processing
choroid empezar lección		the pigmented vascular layer of the eyeball between the retina and the sclera
macula empezar lección		an oval yellowish area surrounding the fovea near the centre of the retina in the eye, which is the region of keenest vision
fovea empezar lección		a small depression in the retina of the eye where visual acuity is highest. The centre of the field of vision is focused in this region, where retinal cones are particularly concentrated
optic disk empezar lección		the raised disc on the retina at the point of entry of the optic nerve, lacking visual receptors and so creating a blind spot.
blind spot empezar lección		the point of entry of the optic nerve on the retina, insensitive to light.
optic nerve empezar lección		each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye.
Optic chaism empezar lección		Joins the optic nerve to the eyes, where nerve fibers cross

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