Optic Nerve

Question 1

Diseases of the optic nerve can be presented by either

Answer 1

1. papilloedema
2. optic atrophy
3. Optic neuritis

Question 2

what is the meaning of papilloedema?

Answer 2

swelling of the optic disc

Question 3

classifiction of optic nerve diseases

according to etiology [11]

Answer 3

1. idiopathic
2. demyelinating
3. viral infection
4. local extension of inflammation
5. toxic
6. vascular
7. heredetary
8. neoplastic
9. neuropathy
10. trauma
11. radiation

Question 4

Total blindness caused by:

Answer 4

Complete lesion of optic nerve

Question 5

Bitemporal hemianopia caused by:

Answer 5

Pressure exerted on optic chiasm
(Pituitary tumor)

Question 6

Right or left homonymous hemianopia caused by

Answer 6

Lesion in the left or right optic tract, respectively.

NB: Remember the nasal fiber(responsibe for temporal vision) is crossing in the optic chiasma, so the left optic tract contains right eye nasal fibers that resposible for right temporal vision

Question 7

Right or left homonymous superior quadrantanopia caused by:

Answer 7

Patial involvement of optic radiation by lesion in the left or right temporal lobe, respectively.

NB: Remember the nasal fiber(responsibe for temporal vision) is crossing in the optic chiasma, so the left optic tract contains right eye nasal fibers that resposible for right temporal vision

Question 8

Right or left homonymous inferior quadrantanopia caused by:

Answer 8

Partial involvement of optic radiation by lesion in the left or right parietal lobe

Question 9

Right or left homonymous hemianopia is also caused by:

Answer 9

Complete lesion of the left or right optic radiation