Across
- 2. the eye's clear, protective outer layer, covering the pupil and iris
- 5. the nerve that carries neural impulses from the eye to the brain
- 7. the dimension of color that is determined by the wavelength of light; what we know as the color names red, blue, green, etc.
- 9. the adjustable opening in the center of the eye through which light enters
- 12. the transparent structure behind the pupil that changes shape to help focus images on the retina
- 15. the theory that the retina contains three different types of color receptors-one most sensitive to red, one to green, one to blue-which, when stimulated in combination, can produce the perception of any color
- 16. the central focal point in the retina, around which the eye's cones cluster (ONLY contains cones and if damaged could impair visual acuity(clearness))
- 17. a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
- 18. the point at which the optic nerve leaves the eye, creating a "blind" spot because no receptor cells are located there
Down
- 1. nerve cells in the brain's visual cortex that respond to specific features of the stimulus, such as shape, angle, or movement
- 3. the light-sensitive, inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information
- 4. the distance from the peak of one light or sound wave to the peak of the next. Electromagnetic wavelengths vary from the short blips of gamma rays to the long pulses of radio transmission
- 6. the amount of energy in a light wave or sound wave, which influences what we perceive as brightness or loudness. ____ is determined by the wave's amplitude (height)
- 8. the theory that opposing retinal processes (red-green, blue-yellow, white-black) enable color vision. For example, some cells are stimulated by green and inhibited by red; others are stimulated by red and inhibited by green
- 10. retinal receptors that are concentrated near the center of the retina and that function in daylight or well-lit conditions. ___detect fine detail and give rise to color sensations(have their own bipolar cells)
- 11. processing many aspects of a problem simultaneously; the brain's natural mode of information processing for many functions, including vision
- 13. the process by which the eye's lens changes shape to focus near or far objects on the retina
- 14. retinal receptors that detect black, white, and gray, and are sensitive to movement; necessary for peripheral and twilight vision, when cones don't respond (share bipolar cells)