1 Basic Facts

Question 1

What is the ratio of of eye to orbit?

Answer 1

1:5

Question 2

Other than the globe, what is in orbit

Answer 2

EOM, Fascia, fat, blood vessels, nerves, lacrimal gland

Question 3

How many layers of the eye are there

Answer 3

3; outer, middle, inner

Question 4

Constituents of Middle layer of eye

Answer 4

Iris, Ciliary body (pars plicata, pars plana) and choroid

Question 5

Describe Axial cut

Answer 5

Sometimes called Transverse Cut, Superior view of structures, can see anterior and posterior pole

Question 6

Describe Sagittal cut

Answer 6

Side cut of eye, can see roof and floor

Question 7

Describe coronal cut

Answer 7

Anterioposterior cut, can see cut sections of muscles, fat

Question 8

What structure is anterior pole of eye

Answer 8

Centre of curvature of cornea

Question 9

What structure is posterior pole and its relation to optic nerve

Answer 9

Centre of curvature of posterior curvature of globe, slightly temporal to optic nerve

Question 10

What is antero-posterior length i.e. length of eye

Answer 10

24mm

Question 11

What is circumference of eye

Answer 11

69-81mm

Question 12

Vertical diameter of eye

Answer 12

23mm

Question 13

Horizontal diameter of eye

Answer 13

23.5mm

Question 14

What is globe volume

Answer 14

7cm3

Question 15

What is orbit volume

Answer 15

30cm3

Question 16

volume of vitreous

Answer 16

3.9cm3

Question 17

volume of aqueous

Answer 17

124mm3

Question 18

Height of orbital opening

Answer 18

35mm

Question 19

Width of orbital opening

Answer 19

40mm

Question 20

Depth of orbit

Answer 20

40mm

Question 21

Inter-orbital distance

Answer 21

25mm