OPTHAMOLOGY Flashcards
What muscle closes the eyelid
Obiluaris oculi
What muscles opens the eyelid
Levator palpebra superioris
What does the conjunctiva produce
Mucins from goblet cells
Whats in tear film layer
Mucin, aqueous, oil
Components of lacrimal system
Lacrimal duct, canillicuil, lacrimal sac, lacrimanl duct
What is a subconjunctiveal haemorrhage
Increase in pressure ruptures capilliaies
Causes of ptosis
COngenital, involutional, neurogeneic, trauma
What does 3rd cranial nerve palsy cause
Complete ptosis, extraoccular muscle loss, dilated pupil (PS travels with 3rd nerve). Consider PCA aneurysm
What is horners syndrome
Partial ptosis, subtle miosis, anyhydrosis
Thyroid eye disease
Autoantibodies cause fibroblast in occular muscles to become fat cells/ become oedematous block off veins increase ocular press. Lid problems protrusion of eyeball
If you have a short eye
Hyperoppia, LS.
Long eye
Myopia. SS
Astigmitsim
Light focused in different areas of eye
How do we exam the cornea
Slit light exam
What happens if endothelial pump in cornea dysfunctional
H2O no longer pumped out, oedematous, opaque cornea. Can cause keratoconus
Function of cornea
Refracts light
What does the lens do
Variable power refraction
What is cataract
Clouding of lens
What do cilliary muscles do
Change lens focus power
What connects lens to cilliary muscles
Zonules
Function of the retina
Absorb light, translate into biochemical then electrical signals to optic nerve.
What is the fovea
Area on retina closely packed cones for sharp central vision held within macula
What causes blindspot
No rods/cones in optic nerve
What is glaucoma
Optic neuropathy associated with increased intraoccqular pressure can be open or closed angle.
