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Flashcards in Eye Deck (21):
0

how can an infection in the eye lead to meningitis?

because the optic nerve is surrounded by meningial layers, and therefore can spread backwards into the brain and meninges

1

what can a lesion of the optic nerve result in?

papillodema

2

what can raised icp result in in the eye?

examptholos
papilloedema
blindness due to compression of the arterial supply

3

explain the structure of the optic nerve

surrounded by dura and pia matter
1.2m axons
central artery and vein

4

what can you use to remember the innervation of the eye muscles?

LR6SO4R3

5

what is the blood supply to the eye?

central artery of the retina
opthalmic artery
infraorbital artery

6

what is the venous drainage of the eye?

superior and inferior orbital veins
superior drains into the cavernous sinus
inferior drains into the pterygoid plexus
central artery of the retina

7

if the arterial supply to the eye were to be cut off, what would happen?

instant blindness

8

if the venous drainage of the eye was compromised, what would happen?

a slower loss of vision

9

what is significant about the venous supply to the eye?

embolism
infection
-->to brain

10

what is the function of the lacrimal gland?

to secrete lacrimal fluid into the eye to lubricate, protect and deliver o2 to the eye

11

where is the lacrimal gland?

it is in the superolateral eye

12

what delivers lacrimal secretions to the eye?

lacrimal ducts

13

what does the lacrimal canaliculi do?

drains the lacrimal pool into the lacrimal sac in the nose

14

what is the nasolacrimal duct?

where the lacrimal sac drains into to enter the inferior meatus to allow swallowing of the fluid

15

what is the lacrimal fluid made from?

oil
water
mucins
enzymes and antibodies

16

what helps lacrimal fluid to disperse?

the blinking reflex

17

where are the tarsal glands situated and what is their function?

to prevent eyelids sticking when they close
they are situated in the tarsal plates

18

where are sebaceous glands situated?

base of eyelash
also called cilliary glands

19

what is a blocked sebaceous gland called?

stye

20

what is a meibomian cyst?

blocked tarsal gland