Terms : Hide Images
| 228291450 | Visible Light | electromagnetic radiation that has a wavelength of about 400 nm to about 750 nm. | |
| 228291451 | Light Intensity | a physical dimension of light waves that referes to how much energy the light contains; it determines the brightness of light. | |
| 228291452 | Light Wavelength | the distance between peaks in light waves. | |
| 228291453 | Cornea | the curved, transparent, protective layer through which light rays enter the eye. | |
| 228291454 | Pupil | an opening in the eye, just behind the cornea, through which light passes. | |
| 228291455 | Iris | the colorful part of the eye, which constricts or relaxes to adjust the amount of light entering the eye. | |
| 228291456 | Lens | the part of the eye behind the pupil that bends light rays, focusing them on the retina. | |
| 228291457 | Retina | the surface at the back of the eye onto which the lens focuses light rays. | |
| 228291458 | Accommodation | the ability of the lens to change its shape and bend light rays so that objects are in focus. | |
| 228291459 | Photoreceptors | nerve cells in the retina that code light energy into neural activity. | |
| 228291460 | Photopigments | chemicals in photoreceptors that respond to light and assist in converting light into neural activity. | |
| 228291461 | Dark Adaptation | the increasing ability to see in the dark as time in the dark increases. | |
| 228291462 | Rods | highly light-sensitive, but color-insensitive, photoreceptors in the retina that allow vision even in dim light. | |
| 228291463 | Cones | photoreceptors in the retina that help us to distinguish colors. | |
| 228291464 | Fovea | a region in the center of the retina where cones are highly concentrated. | |
| 228291465 | Acuity | visual clarity, which is greatest in the fovea because of its large concentration of cones. | |
| 228291466 | Lateral Inhibition | a process in which lateral connections allow one photoreceptor to inhibit the responsiveness of its neighbor, thus enhancing the sensation of visual contrast. | |
| 228291467 | Ganglion Cells | cells in the retina that generate action potentials. | |
| 228291468 | Receptive Field | the portion of the retina, and the visual world, that affects a given ganglion cell. | |
| 228291469 | Optic Nerve | a bundle of fibers composed of axons of ganglion cells that carries visual information to the brain. | |
| 228291470 | Blind Spot | the light-insensitive point at which axons from all of the ganglion cells converge and exit the eyeball. | |
| 228291471 | Optic Chiasm | part of the bottom surface of the brain where half of each optic nerve's fibers cross over to the opposite side of the brain. | |
| 228291472 | Lateral Geniculate Nucleus (LGN) | a region of the thalamus in which axons from most of the ganglion cells in the retina end and form synapses. | |
| 228291473 | Primary Visual Cortex | an area at the back of the brain to which neurons in the lateral geniculate nucleus relay visual input. | |
| 228291474 | Feature Detectors | cells in the cortex that respond to a specific feature of an object. | |
| 228291475 | Hue | the essential "color," determined by the dominant wavelength of light. | |
| 228291476 | Saturation | the purity of a color. | |
| 228291477 | Brightness | the overall intensity of all of the wavelengths that make up light. | |
| 228291478 | Trichromatic Theory | a theory of color vision identifying three types of visual elements, each of which is most sensitive to different wavelengths of light. | |
| 228291479 | Opponent-Process Theory | a theory of color vision stating that color-sensitive visual elements are grouped into red-green blue-yellow, and black-white elements. | |
| 228291480 | Synesthesia | a blending of sensory experience that causes some people to "see" sounds or "taste" colors, for example. |
