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The Eye and Its Functions

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Queen's University
PSYC 100
Ingrid Johnsrude

The Eye and It’s Functions 6/8/2012 6:47:00 AM wavelength- the distance between adjacent waves of radiant energy, in vision, most closely associated with the perceptual dimension of hue cornea- transparent tissue covering the front of the eye sclera – the tough outer layer of the eye (white) iris – the pigmented muscle of the eye that controls the size of the pupil lens – the transparent organ situated behind the iris of the eye, helps focus the image on the retina accommodation – changes in thickness of the lens of the eye that focus images of near and distant objects in the retina photoreceptors – specialized neurons that transduce light into neural activity optic disc – a circular structure located at the exit point from the retina of the axons of the ganglion cells that form the optic nerve cells of the retina  photoreceptors (back)  bipolar cell layer (middle) o receives information from photoreceptors and passes it on to the ganglion cells, then axons proceed through the optic nerves to the brain  ganglion cell layer (front) o receives information from photoreceptors by means of bipolar cells and then axons proceed through optic nerves to the brain rod – photoreceptor that is sensitive to light cone – photoreceptor that is responsible for daytime vision and colour perception fovea- small pit near the centre of the retina containing densely packed cones, responsible for acute and detailed vision transduction of light into neural activity  photoreceptor o photon strikes photo pigment, photo pigment splits, chemical reactions produce message  bipolar cell o message is sent to bipolar cell  ganglion cell o message is transmitted to ganglion cell, then sent to the brain Photo pigment – a complex molecule found in photoreceptors, when struck by light it splits and stimulates the membrane of the photo
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