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18 Cards in this Set
- Front
- Back
Synaptic vesicles contain chemicals called _________ that are released across the synapse to the next neuron. |
neurotransmitters |
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Acuity develops to almost 20/20 vision by the time the infant is |
one year old |
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As stimulus intensity is increased, recording from a single neuron shows |
the rate of firing of the nerve fiber increases. |
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Light can be described in terms of wavelength, or as consisting of small packets of energy called |
photons. |
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The visual pigment molecules are contained in the |
outer segments of the visual receptors. |
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Rushton demonstrated that the physiological mechanism behind dark adaptation is |
visual pigment regeneration. |
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Cone spectral sensitivity is measured by having the observer |
look directly into a light. |
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The Purkinje shift |
is when reds appear brighter than blues in well-lit conditions, but blues appear brighter than reds in dim conditions. |
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Individual suffering from myopia may have difficulty seeing _______ objects clearly. Often times they are also referred to as being _______. |
distant; nearsighted |
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A wavelength of 100 nm would fall in the ______ range of the electromagnetic spectrum. |
ultraviolet rays |
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The “rod-cone break” in the dark adaptation curve occurs after about ___ in the dark. |
7 minutes |
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Jan tries to focus on the tip of her pencil as she brings it closer to her. She feels the strain on her eye as she does this. What she is feeling in her eye is due to the process called |
accommodation. |
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Convergence results in _________ sensitivity and _______ acuity. |
increased; decreased |
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Nina does a demonstration of “seeing” the blind spot, in which a grid pattern surrounds the black dot that disappears when it falls on the blind spot. What does Nina most likely see in the area where the dot disappears? |
a continuation of the grid pattern |
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Rods and cones synapse with ______ cells, which then synapse with ____ cells. |
bipolar; ganglion |
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A retinal condition that destroys the cones in the fovea is |
macular degeneration. |
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In the early stages of _______, peripheral rod receptors are destroyed leading to poorer peripheral vision. |
retinitis pigmentosa |
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The structure of the eye that provides about 80% of the eye’s focusing power is the |
cornea. |