Visual Pathway

Question 1

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<p>what is the visual field?</p>

Answer 1

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<p>everything you see with one eye including the periphery is your visual field</p>

Question 2

<p><p>what is the visual field?</p></p>

Answer 2

<p><p>everything you see with one eye including the periphery is your visual field</p></p>

Question 3

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Answer 3

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Question 4

<p><p>where will the image of what you are focusing on fall?</p></p>

Answer 4

<p><p>the fovea

| everything else will fall in the periphery of the retina</p></p>

Question 5

<p><p>what does visual acuity test for?</p></p>

Answer 5

<p><p>refractive errors and other errors

| this tests the fovea</p></p>

Question 6

<p><p>what does the visual field testing test for?</p></p>

Answer 6

<p><p>the entire visual field you have</p></p>

Question 7

<p><p>how are images formed in your retina?</p></p>

Answer 7

<p><p>images of objects in your field of vision are upside down and inverted</p></p>

Question 8

<p><p>where will the image of what you are focusing on fall?</p></p>

Answer 8

<p><p>the fovea

| everything else will fall in the periphery of the retina</p></p>

Question 9

<p><p>what does visual acuity test for?</p></p>

Answer 9

<p><p>refractive errors and other errors

| this tests the fovea</p></p>

Question 10

<p><p>what does the visual field testing test for?</p></p>

Answer 10

<p><p>the entire visual field you have</p></p>

Question 11

<p><p>how are images formed in your retina?</p></p>

Answer 11

<p><p>images of objects in your field of vision are upside down and inverted</p></p>

Question 12

<p><p>what is involved in the visual pathway? where is it found?</p></p>

Answer 12

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Question 13

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Answer 13

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Question 14

<p>where is the optic chiasm found?</p>

Answer 14

<p>inferior surface of brain and the optic nerves coming back from eyes meet at the structure named the optic chiasm. the optic chiasm sits just superior to the pituatory fossa</p>

Question 15

where does the optic tract do?

Answer 15

it passes through the diencephalon and into the lateral genicunate body where it synapses

Question 16

where is the primary visual cortex located?

Answer 16

in area number 17 of the occipital lobe - the primary visual cortex

Question 17

whta happens at the optic chiasm?

Answer 17

at the optic chiasm, nasal fibres cross while temporal fibres do not.
this means that the fibres of one side are perceiving the visual field of the opposite side.

Question 18

what damage do you expect when different parts of the visual pathway are damaged?

Answer 18

• right optic nerve damaged = blindness in one eye
• optic chiasma disrupted in the middle = bitemporal hemianopia (half blindness in outer parts of each eye)
• right optic tract damaged = contralateral homonymous hemianopia (blindness in left sides of eye)
• optic radiation damaged = contralateral homonymous hemianopia