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20 Cards in this Set
- Front
- Back
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Anterior chamber |
The region of the eye between the cornea and the lens that contains aqueous humor. |
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Aqueous humor |
The fluid produced in the eye |
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Ciliary body |
CONTROLS SHAPE OF LENS
Ciliary epithelium: Produces the aqueous humor
Ciliary muscle: Are either longitudinal, radial or circular. (when these muscles contract the circular ciliary body diameter reduces, this relaxes the zonular fibres reducing tension on the outside of the lens allowing lens become a more rounder shape.>>NEAR VISION ACCOMODATION) Changes shapes of lens
Ciliary processes: these attach the lens to the ciliary body using zonular fibres (forming suspensory ligament of the lens)
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Choroid |
Layer of connective tissues and blood vessels behind the retina. Provides nourishment to the outer layers of the retina |
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Cones |
The photoreceptor nerve cells present in the macula in the fovea (very center of the macula) -Not very light sensitive -fast response to light -high visual acuity -less pigment than rods so require more light to detect images
It enables people to see very fine detail and colour |
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Cornea |
The outer transparant structure at the front of the eye that covers the iris, pupil and anterior chamber. It is the eye's primary light-focusing structure. |
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Fovea |
The pit or depression at the center of the macula that provides the greatest visual acuity. |
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Iris |
Coloured ring of tissue behind the cornea that regulates the amount of light entering the eye by adjusting the size of the pupil. |
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Lens |
The transparent structure suspended behind the iris that helps to focus light on the retina. |
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Macula |
The portion of the eye at the center of the retina that processes sharp, clear straight-ahead vision. |
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Optic nerve |
The bundle of nerve fibers at the back of the eye that carry visual messages from the retina to the brain |
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Photoreceptors |
The light sensing nerve cells (rods and cones) located in the retina |
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Pupil |
The adjustable opening at the center of the iris through which light enters the eye |
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Retina |
The light sensitive membrane that lines the back of the eye and process light.
Converts light into electrical impulses that are sent through the optic nerve CONSISTS OF NEURAL AND GLIAL CELLS |
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Retinal Pigmented Epithelium (RPE) |
A layer of cells that protects and nourishes the retina, removes waste products, prevents new blood vessels growth into the retinal layer and absorbs light not absorbed by the photoreceptor cells. These actions prevent the scattering of the light and enhance clarity of vision. |
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Rods |
Photoreceptor nerve cells in the eyes that are sensitive to low light levels and are present in the retina, but outside the macula. -very light sensitive -low visual acuity -slow response to light -more pigment than cones -loss causes night blindness |
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Sclera |
The tough outer coat that protects the entire eyeball. |
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Trabecular meshwork |
Spongy tissue located at the base of cornea through which aqueous humor drains out of the eye. |
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Vitreous |
Clear jelly'like substance that fills the eye from the lens to the back of the eye |
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Regions of the retina |
Parafovea- cone and rods, inner and outer nuclear layers Periforvea- all retinal layers, thickest part |
