Visual pathways Flashcards
1
Q
where is the blind spot?
A
where the head of the optic nerve is present
2
Q
Why is there a blind spot?
A
There are only nerve fibers in this region and no photocreceptors
3
Q
Which part of the eye contributes the majority of our conscious vision?
A
The macula
4
Q
Describe the structure of the retina
A
10 layers:
- ganglion cells
- bipolar cells
- photoreceptors
- retinal pigment epithelium
- choroid
5
Q
What is the fovea?
A
The middle of the macula - an indentation
6
Q
Describe the structure of the fovea
A
the ganglion cells and bipolar cells are not present, leaving the photoreceptors
7
Q
Why is the macula more efficient in visual processing than other areas of the retina?
A
- The light shines directly onto the photoreceptors and doesnt need to pass through/be processed by other layers first
- blood vessels are present in the retina but not at the area of the fovea
= clear vision
8
Q
How does the fovea acquire metabolic support?
A
From the choroid through diffusion as it is a thin layer
