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Definition
| distance between the peaks of the electromagnetic waves |
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| wavelengths range from 400-700 nanomoters |
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| Where light reflected from the object in the environment enters the eye through the pupil, and is focused by the cornea and lens from to form sharp images of the objects on the retina, which contains receptors for vision. |
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Definition
| conducts signals toward the brain |
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Definition
| ciliary muscles at the front of the eye tighten and increase the curvature of the lens so that it gets thicker to keep objects in focus |
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| the part of the visual pigment that is sensitive to light |
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| when a photon of light hits the retinal, it changes shape and sticks out in front of the opsin and triggers change of light into electricity. |
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| A long strand of protein that loops back and forth on the visual pigment |
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Definition
1. a person can see light if 7 rods are activated simultaneously
2. a rod can be activated by isomerization of 1 visual pigment |
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| Contains only cones, when we look directly at an object, the image falls on the fovea. |
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Definition
| the degeneration of the fovea and a small area around it |
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Definition
| degeneration of the retina |
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| the increased sensitivity of the eye to the dark. |
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| Place where the rods begin to determine the dark adaptation curve. |
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| When isomerization occurs, the retina becomes lighter in color |
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| visual pigment regeneration |
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Definition
| when opsin and retinal rejoin after isomerization |
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Term
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Definition
1. sensitivity to light depends on the concentration of the visual pigment
2. the speed at which our sensitivity is adjusted in the dark depends on the regeneration of the visual pigment |
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Definition
| light that contain only a single wavelength |
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Term
| Minimum light needed is... |
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Definition
| found in the middle of the visual spectrum |
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Term
| Spectral sensitivity curve |
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Definition
| Threshold converted to sensitivity to measure the sensitivity to light at each wavelength across the visible spectrum |
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Term
| Rods are more sensitive to short wavelength light than cones. This difference in sensitivity means that as vision shifts from rods to cones during dark adaptation, we become relatively more sensitive to short wavelength which is... |
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Definition
| light nearer the blue and green end of the spectrum |
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Term
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Definition
| the amount of light absorbed by a substance versus the light wavelength |
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| Spectral sensitivity curve is mostly determined by... |
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Definition
| medium and long wavelength pigments |
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| The greater convergence of rods compared to cones= |
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Definition
1. rods having better sensitivity than cones
2. cones having better detail vision than rods |
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Definition
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| inhibition transmitted across the retina |
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Definition
| when our perception of the brightness or color of one area is affected by the presence of an adjacent area |
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Term
| If we know the initial out put of each receptor and the amount of lateral inhibtion we can... |
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Definition
| calculate the final putput pf the receptors |
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