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Basic Vision Lab Seeing is Believing: The Physiology of Vision

Basic Vision Lab Seeing is Believing: The Physiology of Vision. S.J. Hamstra, Ph.D. Department of Surgery University of Toronto. individual.utoronto.ca/stan_hamstra/. Vision & Visual Science. > Ophthalmology Association for Research in Vision & Ophthalmology (ARVO)

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Basic Vision Lab Seeing is Believing: The Physiology of Vision

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  1. Basic Vision LabSeeing is Believing: The Physiology of Vision S.J. Hamstra, Ph.D. Department of Surgery University of Toronto

  2. individual.utoronto.ca/stan_hamstra/

  3. Vision & Visual Science • > Ophthalmology • Association for Research in Vision & Ophthalmology (ARVO) • Investigative Ophthalmology & Vision Science • Vision Research • VisionScience.com

  4. Objectives quick overview of: • retinal processing • visual cortex • basis for illusions • relevance to clinical applications

  5. Seeing is Believing • Receptive Field • Retinal Interactions • lateral inhibition • Cortical Processes • Clinical Applications • visual acuity • low contrast effects

  6. Receptive Field

  7. Receptive Field

  8. Receptive Field

  9. Receptive Field

  10. Receptive Field • A cell’s receptive field is the patch of retina that, when stimulated, produces a response in that cell

  11. Lateral Inhibition

  12. Lateral Inhibition • On Centre • excited by light • Off Surround • excited by dark

  13. Lateral Inhibition Spot Mapping of Receptive Fields

  14. Lateral Inhibition Hermann Grid

  15. Lateral Inhibition

  16. Lateral Inhibition

  17. Lateral Inhibition • Demonstration • visionscience.com

  18. Lateral Inhibition

  19. Cortical Processes

  20. Cortical Processes

  21. Cortical Processes Four Types of Visual Information Processing • Luminance Contrast • Motion • Depth • Colour

  22. Cortical Processes

  23. Cortical Processes

  24. Cortical Processes • More than just eye and optic nerve • Complex interaction b/w your physiology and the environment

  25. Cortical Processes

  26. Clinical Applications

  27. Clinical Applications Low Contrast Acuity

  28. Clinical Applications Effects of Glare on Low Contrast Acuity

  29. slide 31 - See text Fig. 5.22

  30. Slide 32

  31. Slide 33

  32. slide 34 - See text Fig. 5.25

  33. Lateral Inhibition

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