3.3.1 Vision II Flashcards
What are the covered parts?
What is the pathway of aqueous humor flow?
Ciliary body → posterior chamber → pupil → anterior chamber → Canal of Schlem
What allows for contraction and dilation of the pupil?
An inner sphincter muscle - constricts the pupil
Outer radial muscle - dilates the pupil
Describe the beginning of signal processing in the retina?
Photoreceptors transduce photons into neuronal activity and synapthic processing begins in the retina.
Ganglionic cell axons will travel to the thalmus
What are the covered parts?
Where must light be focused to initiate processing of visual signals?
Light must be focused precisely on the neural retina
What are the two locations in the eye at which light is refracted?
Cornea - static refraction
Lens - dynamic refraction
What is the difference between a hyperopic eye and a mypoic eye?
Hyperopic eyes tend to have a focal length that is behind the retina in space, thus making them “far-sighted”
Myopic eyes tend to have a focal length that is located in front of the retina, thus making them “near-sighted”
What is presbyopia?
Lens of the eye hardens making it resistance to changes in shape
How is a map of the external environment created on each retina?
Humans have binocular vison, what does this mean?
Both eyes can focus on a single space - unlike a fish
Vision from the left side of the visual field is interpreted where? Right side?
Structures distal to the optic chiasm contain a retina map of?
The contralateral visual field with contributions from both eyes for binocular regions
Visual fields outside the binocular region must be?
Decussate to reach the contralateral side of the brain
What is the process by which visual transduction occurs in photoreceptor outer segements?