Exam 3

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scari
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89948
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Exam 3
Updated:
2011-06-09 16:30:41
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Eye, ear
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  1. Wavelength
    the distance between successive peaks or troughs
  2. Frequency
    the number of waves per second
  3. Amplitude
    Height difference between wave trough and peak
  4. Higher energy waves of light are what color?
    Blue light waves are higher or lower energy?
  5. Red waves have a higher or lower energy?
    Which color light wave has a lower energy?
  6. What is the spectrum humans can see?
    400-700nm is the spectrum that ______ can see
  7. Pupil
    The opening that allows light into the eye
  8. Iris
    Pigmented (color) of eye, expands or contracts to make the pupil smaller or larger.
  9. When the pupil size is decreased what can be seen better (in good light)?
    Distant objects come into better focus.
  10. If the pupil size is increased what happens to the depth of field?
    The depth of field is decreased (you can see better up close).
  11. Your pupil size will be larger or smaller in bright light?
    Smaller.
  12. How does bright light effect your depth of field (depth of focous)?
    It will increase it.
  13. What is visual acuity limited by?
    How does the number of photons hitting the retina effect your visual acuity?
  14. About how many degrees is the visual field for each eye?
    150
  15. How does the wavelength of light relate to vision?
    • Shorter wavelength=higher frequency
    • Longer wavelenght=lower frequency
    • Wavelength effects what we can and cannot see.
  16. Why can we see objects?
    Because photons reflect off of them and hit our eyes (retina)
  17. Refraction is related to vision how?
    Immages are formed in the eye due to the ______ of light.
  18. Fovea
    center of color vision good for bright light
  19. Fat lens is for:
    Near (keep the cookies close)
  20. Flat lens is for
    Far (in the distance everything looks flat)
  21. accomodation is
    changing the shape of the lens
  22. Layers of the retina
    nerve fibers, ganglionic layer, inner plexiform layer, bipolar layer, outer plexiform layer, photoreceptor layer, pigmented cell layer, Choroid.
  23. Sensory retina:
    photoreceptor, bipolar cell, ganglion cell
  24. Pigmented retina
    single layer of pigmented cells
  25. Divergence
    happens when light strikes a concave surface
  26. Convergence
    Happens when light strikes a convex surface
  27. Focal point
    point where light rays converge and cross (more spherical = more bent)
  28. Emmetropia
    normal resting condition of the lens
  29. Convergence
    Eyes both move toward the centerline
  30. Refraction in the eye is measured in
    Diopters
  31. Myopia
    Nearsightedness
  32. To be near sighted means that your eye is too long so you...
    Can see close objects clearly but not distant
  33. Myopia is corrected by what kind of lens?
    Concave, or radial kertotomy, or laser corneal sculpting
  34. In myopia where does the cornea and lens focus the object?
    in front of the retina
  35. Hyperopia is also called what?
    Farsightedness
  36. How is hyperopia corrected?
    convex lenses
  37. Hyperopia's symptoms:
    close objects are blurry but distance is okay
  38. Where is the immage focused with Hyperopia?
    behind the retina
  39. Light turns the cell on or off?
    OFF it was depolarized and firing till it got turned off.
  40. More light hitting a receptor would cause what?
    more stopping of firing
  41. How many different kinds of opsins are present in cones?
    three kinds of opsins green, red, and blue are present in what structure?
  42. How are bipolar cells classified?
    Which cells are classified by the amount of glutamate released by photoreceptors?
  43. What is the source of output to the brain from the retina?
    Ganglion cells are the source output to the brain from where?

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