Download - Fundamentals of Sensation and Perception LIGHT AND THE EYES ERIK CHEVRIER NOVEMBER 10, 2015
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Fundamentals of Sensation and Perception LIGHT AND THE EYES
ERIK CHEVRIER
NOVEMBER 10, 2015
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Video Light Waves – Visible and Invisible
Is Light a Particle or Wave?
Particles and Waves
What are all those Floaty Things in Your Eye?
The Evolution of the Human Eye
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The Human Visual System
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Light Electromagnetic Radiation
Light is a wave◦ Wavelength
Light is a particle◦ Photon
◦ Absorbs◦ Reflects◦ Refracts
Optic Array
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Field of View
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Acuity and Eye Movements
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Extraocular Muscles
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Structure and Function of the Eye
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Lens and Accommodation
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Retina
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Retina
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Retina
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Rods and Cones
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Rods and Cones
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Rods and Cones
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Rods and Cones – Operating Range
Dark Adaptation
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Retinal Ganglion Cells (RGC)
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Receptive Field
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RGC Center-Surround Receptive Field
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RGC Center-Surround Receptive Field
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Lateral Inhibition
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Disorders of Vision Strabismus – Disorder of extraocular muscles where the two eyes are not allied with one another. Causes blurry vision.
Amblyopia – Neural signals from one eye are not processed properly. Fine vision does not develop in that eye.
Disorders of accommodation ◦ Myopia◦ Hyperopia◦ Presbyopia◦ Astigmatism
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Disorders of Vision Glaucoma – Intraocular pressure is too high for a person’s eye caused by a blockage of the openings that let aqueous humor drain from the anterior chamber.
Floaters – Shadows on the retina thrown by debris within the vitreous humor.
Phosphenes – Brief, tiny flashes in the person’s field of view not caused by light but a variety of other causes.
Retinitis Pigmentosa – an inherited condition which there is gradual degeneration of the photoreceptors over many years.
Macular Degeneration – Damage to photo receptors in the macula. ◦ Dry – Cells degenerate in the pigment epithelium which cause the loss of photo receptors overlaying
those cells. ◦ Wet – New blood vesicles grow under the retina, leak fluid, bleed and scar.
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Questions? Have a great day!