Fundamentals of Sensation and Perception LIGHT AND THE EYES
ERIK CHEVRIER
NOVEMBER 10, 2015
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
The Human Visual System
Light Electromagnetic Radiation
Light is a wave◦ Wavelength
Light is a particle◦ Photon
◦ Absorbs◦ Reflects◦ Refracts
Optic Array
Field of View
Acuity and Eye Movements
Extraocular Muscles
Structure and Function of the Eye
Lens and Accommodation
Retina
Retina
Retina
Rods and Cones
Rods and Cones
Rods and Cones
Rods and Cones – Operating Range
Dark Adaptation
Retinal Ganglion Cells (RGC)
Receptive Field
RGC Center-Surround Receptive Field
RGC Center-Surround Receptive Field
Lateral Inhibition
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
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.
Questions? Have a great day!
Top Related