Rods: Photoreceptor nerve cells in the eyes that are sensitive to low light levels and are present in the retina, but outside the macula. Retinal Pigmented Epithelium (RPE): A layer of cells that protects and nourishes the retina, removes waste products, prevents new blood vessel 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. Depending on how near or far away the object is that were looking at, the cornea and lens work together to bring the light into focus on the retina (the back. Sclera - the white visible portion of the eyeball. Retina: The light sensitive layer of tissue that lines the back of the eye. The retina senses light and creates impulses that are sent through the optic nerve to the brain. Photoreceptors: The light sensing nerve cells (rods and cones) located in the retina. Macula: The portion of eye at the center of the retina that processes sharp, clear, straight-ahead vision. Glossary of Termsīruch's membrane: Located in the retina between the choroid and the retinal pigmented epithelium (RPE) layer provides support to the retina and functions as the 'basement' membrane of the RPE layer.Ĭhoroid: Layer of the eye behind the retina contains blood vessels that nourish the retina.Ĭones: The photoreceptor nerve cells present in the macula and concentrated in the fovea (the very center of the macula) enable people to see fine detail and color.įovea: The pit or depression at the center of the macula that provides greatest visual acuity.įoveola: the foveola lies in the center of the fovea and contains only cone cells, The retinal pigmented epithelium (RPE) protects and nourishes the retina, removes waste products and prevents new blood vessels from growing into the retina. Bruch's membrane provides support to the retina. The choroid layer contains blood vessels that nourish the retina. The pit or depression within the macula, called the fovea, provides the greatest visual acuity. The retina is the paper-thin tissue that lines the back of the eye and contains the photoreceptor (light sensing) cells (rods and cones) that send visual signals to the brain. The macula is located near the center of the retina its function is to process harp, clear, straight-ahead vision.
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