Intro Flashcards
Human visual perception is said to be veridical.
What does veridical mean?
Accurate (what we see is what there is)
What is a human’s sensitivity range?
10 log units
Other than our sensitivity range, what else is strongly linked to our veridical vision?
Ability to adapt to ambient levels of stimulation and detect differences within that range
What are some contrasts, in which we can detect differences, making up the early stages of visual perception? (5)
- Light
- Color
- Size
- Orientation
- Position
From external to internal, what are the layers of the retina?
- RPE
- PR
- ELM
- ONL
- OPL
- INL
- IPL
- GCL
- NFL
- ILM
External Limiting Membrane contains…
Mueller cell endings
Outer Nuclear Layer contains…
Cell bodies of rods/cones
Outer Plexiform Layer contains…
Synapses between PRs and bipolar and horizontal cells
Inner Nuclear Layer contains…
Cell bodies of bipolar, horizontal, and amacrine cells
Inner Plexiform Layer contains…
Synapses between bipolar, amacrine, and ganglion cells
Ganglion Cell Layer contains…
Ganglion Cell bodies
Nerve Fiber Layer contains…
Ganglion fibers (axons)
Inner Limiting Membrane contains…
Muller cell endings
How many rods per eye?
125 million
How many cones per eye?
6.3-6.8 million
How many ganglion cells per eye?
1 million
What are the two major types of ganglion cells?
- Midget aka Parvo
- Parasol aka Magno
How large is the Optic Nerve Head? (In mm and degrees)
1.8 mm, 5 degrees
Where is the physiological blind spot?
15º temporal to fixation
Fovea exhibits an absence of which PR, and and maximum density of which PR?
Absence of rods
Maximum of cones
T/F: The fovea is the same size as the ONH
TRUE
How thick is the fovea, relative to the rest of the retina?
1/2
Macular region is what size? (in mm and degrees)
5-6 mm, 20 degrees
How many cones can be found in the fovea?
> 100,000 cones in the fovea
