VISION:
LIGHT & THE EYE
Preparation before attending class:
Read:
http://www.amazon.com/Foundations-Sensation-Perception-
Second-Edition/dp/184169...
VISION:
LIGHT & THE EYE
(I play “Long As I Can See The Light” by Creedence
Clearwater Revival as students enter to set the...
Agenda
Review Neuroscience 101 lecture
Light
The Eye
REVIEW!
(This is done via the clicker system, http://clickers.umd.edu/)
The _______ lobe is circled.
A. occipital
B. parietal
C. temporal
D. frontal
The circled part(s) is(are):
A. Soma
B. Dendrites
C.Axon
D.Axon terminals
The human brain has ______
connections than cells:
A. 2x more
B. 10x more
C. 100x more
D. 1000x more
LIGHT
WHAT IS LIGHT?
A BRIEF HISTORY
OF LIGHT
Newton
Huygens
Young
Maxwell
Planck
Einstein
3 Theories of Light
Rays
Waves
Particles
Rays
Light travels in straight lines at high speed
Useful to understand lens & images
Waves
Light is a wave vibrating at a specific frequency
Useful in understanding color perception
Particles
Light is discrete packets of energy (photons)
Useful low light levels because they can be
counted individually
The visible spectrum is a limited (small)
part of electromagnetic radiation
InfraredUltraviolet
Important Properties of Light
Reflection
Light rays are
scattered backward
at surface
Why is this important for vision?
This is how we see objects.
Transmission
Light quanta of certain
wavelengths are
scattered by the
molecules they hit
Why is this important for vision?...
Absorption
Light quanta are taken
up by a substance
converted to other
types of energy
Why is this important for vision?
T...
What is luminance?
A photometric measure of the energy
Measured in candelas per square meter of surface
Luminance
Summary
Physics of light
Important properties of light
Luminance
?
THE EYE
Overview
Structure
Optical properties
Overview of the Eye
The Eye
The Cornea
The transparent membrane which allows light
to enter and starts the process of focusing
The Iris
Responsible for controlling the diameter of the pupils
and thus the amount of light reaching the retina
The Pupil
The circular aperture through which light passes.
Dilates and contracts to vary light levels in the eye.
The Lens
Transparent, biconvex structure
which helps the focusing process
The Retina
A light-sensitive tissue lining the inner surface of the eye
Tranduces light energy into neural signals
The Fovea
The center of region of the retina
Image Size on the Retina
Focusing Images on the Retina
80% Cornea, fixed
20% Lens, variable
Accommodation
The process by which the lens adjusts shape
to focus light from objects on the retina.
Accommodation
In a relaxed eye, parallel
rays from a distant object
fall into focus on the retina.
Diverging rays from a
n...
(I play a part of video which reinforces how the structure
of the eye supports the function of the eye)
Why do the eyes move?
Lots of reasons ...
Spatial resolution
Binocular registration
Spatial Resolution
Eye movements maintain the center of attention
on the most acute part of the eye, the fovea.
Binocular Registration
Since the eyes are a short distance apart in the head,
they have to make vergence movements to main...
Summary
The structure of the eye supports the
function of the eye.
Eye movements serve to maintain high
resolution and bin...
?
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Vision: Light & The Eye (Sample Lecture Slides)

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An example of my lecture slides for Sensation and Perception.

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Vision: Light & The Eye (Sample Lecture Slides)

  1. 1. VISION: LIGHT & THE EYE
  2. 2. Preparation before attending class: Read: http://www.amazon.com/Foundations-Sensation-Perception- Second-Edition/dp/1841696994, pages 159-183 Watch: http://www.youtube.com/watch?v=Lg73u1B61rM http://ed.ted.com/lessons/how-do-we-see-color-colm-kelleher Check out: http://serendip.brynmawr.edu/bb/blindspot1.html
  3. 3. VISION: LIGHT & THE EYE (I play “Long As I Can See The Light” by Creedence Clearwater Revival as students enter to set the mood)
  4. 4. Agenda Review Neuroscience 101 lecture Light The Eye
  5. 5. REVIEW! (This is done via the clicker system, http://clickers.umd.edu/)
  6. 6. The _______ lobe is circled. A. occipital B. parietal C. temporal D. frontal
  7. 7. The circled part(s) is(are): A. Soma B. Dendrites C.Axon D.Axon terminals
  8. 8. The human brain has ______ connections than cells: A. 2x more B. 10x more C. 100x more D. 1000x more
  9. 9. LIGHT
  10. 10. WHAT IS LIGHT?
  11. 11. A BRIEF HISTORY OF LIGHT
  12. 12. Newton
  13. 13. Huygens
  14. 14. Young
  15. 15. Maxwell
  16. 16. Planck
  17. 17. Einstein
  18. 18. 3 Theories of Light Rays Waves Particles
  19. 19. Rays Light travels in straight lines at high speed Useful to understand lens & images
  20. 20. Waves Light is a wave vibrating at a specific frequency Useful in understanding color perception
  21. 21. Particles Light is discrete packets of energy (photons) Useful low light levels because they can be counted individually
  22. 22. The visible spectrum is a limited (small) part of electromagnetic radiation
  23. 23. InfraredUltraviolet
  24. 24. Important Properties of Light
  25. 25. Reflection Light rays are scattered backward at surface Why is this important for vision? This is how we see objects.
  26. 26. Transmission Light quanta of certain wavelengths are scattered by the molecules they hit Why is this important for vision? This is how our eyes focus.
  27. 27. Absorption Light quanta are taken up by a substance converted to other types of energy Why is this important for vision? This is how we convert light into neural signals
  28. 28. What is luminance? A photometric measure of the energy Measured in candelas per square meter of surface
  29. 29. Luminance
  30. 30. Summary Physics of light Important properties of light Luminance
  31. 31. ?
  32. 32. THE EYE
  33. 33. Overview Structure Optical properties
  34. 34. Overview of the Eye
  35. 35. The Eye
  36. 36. The Cornea The transparent membrane which allows light to enter and starts the process of focusing
  37. 37. The Iris Responsible for controlling the diameter of the pupils and thus the amount of light reaching the retina
  38. 38. The Pupil The circular aperture through which light passes. Dilates and contracts to vary light levels in the eye.
  39. 39. The Lens Transparent, biconvex structure which helps the focusing process
  40. 40. The Retina A light-sensitive tissue lining the inner surface of the eye Tranduces light energy into neural signals
  41. 41. The Fovea The center of region of the retina
  42. 42. Image Size on the Retina
  43. 43. Focusing Images on the Retina 80% Cornea, fixed 20% Lens, variable
  44. 44. Accommodation The process by which the lens adjusts shape to focus light from objects on the retina.
  45. 45. Accommodation In a relaxed eye, parallel rays from a distant object fall into focus on the retina. Diverging rays from a nearer object will fall into focus behind the retina. In this case, muscles in the eye change the shape of the lens to maintain focus on the retina.
  46. 46. (I play a part of video which reinforces how the structure of the eye supports the function of the eye)
  47. 47. Why do the eyes move? Lots of reasons ... Spatial resolution Binocular registration
  48. 48. Spatial Resolution Eye movements maintain the center of attention on the most acute part of the eye, the fovea.
  49. 49. Binocular Registration Since the eyes are a short distance apart in the head, they have to make vergence movements to maintain binocular fixation Useful in depth perception
  50. 50. Summary The structure of the eye supports the function of the eye. Eye movements serve to maintain high resolution and binocular fixation.
  51. 51. ?

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