WWK- Structure of the human eye

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empezar lección

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término		definición
sclera empezar lección		the white outer layer of the eyeball. At the front of the eye it is continuous with the cornea.
cornea empezar lección		the transparent layer forming the front of the eye.
lacrimal glands empezar lección		Lacrimal gland definition, either of two tear-secreting glands situated in the upper outer angle of the orbit.
iris empezar lección		a flat, coloured, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the centre.
pupil empezar lección		the dark circular opening in the centre of the iris of the eye, which varies in size to regulate the amount of light reaching the retina.
cilairy muscles empezar lección		the part of the eye that connects the iris to the choroid
aqueous humor empezar lección		the clear fluid filling the space in the front of the eyeball between the lens and the cornea.
lens empezar lección		a piece of glass or other transparent material with curved sides for concentrating or dispersing light rays
vitreous humor empezar lección		the transparent jelly-like tissue filling the eyeball behind the lens.
retina empezar lección		a layer at the back of the eyeball that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
chorioid 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		an area where a person's view is obstructed.
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.

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