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Flashcards in Optic Disc Assessment Deck (14)
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1

What is the optic disc?

Optic nerve viewed end on

2

What is the optic cup?

Space within the optic nerve where no axons are present

This is the pale centre of the optic disc

3

The size of the optic cup depends on which 2 factors?

  1. Scleral opening size
  2. No of axons within optic nerve

4

Which 3 things must be examined and commented on when exmaining an optic disc?

  1. Cup
  2. Colour
  3. Contour

5

How should a healthy optic disc look?

Orange/pink rim with pale centre

6

What is the optic contour?

The definition of the optic disc border

(should be well defined)

7

For which reasons may an optic disc lose its outer peachy colour?

  1. Glaucoma (advanced)
  2. Optic neuritis
  3. Arteritic or non-arteritic ischaemic optic neuropathy
  4. Compressive lesion

8

What is the cup to disc ratio?

Vertical size of optic cup estimated in relation to the disc as a whole

9

What is the normal cup to disc ratio?

0.3

10

What does an increasing cup to disc ratio suggest?

Glaucoma

(decrease in the quantity of healthy neuro-retinal tissue)

11

What can cause a bitemporal hemionopia?

Macroadenoma pituitary tumour

12

How does bitemporal hemionopia often present?

Incidentally at opticians

13

What may cause an enlarged blind spot?

  1. Optic neuritis
  2. Papilloedema

14

What is papilloedema?

Optic disc swelling caused by increased intracranial pressure