Physiology - Vision 1 Flashcards
the sclera allows attachment of which muscles
a.intraocular
b.extraocular
c.cilliary
b.extraocular
long lasting eye disorder that causes blurred vision or a blind spot in central vision , caused by blood vessels leaking into the macula
a.wet macula degeneration
b.acute glaucoma
c.chronic glaucoma
d.horners syndrome
e.cataracts
a.wet macula degeneration
myopia
a.short sightedness
b.long sightedness
a.short sightedness
cant see far away things
hypermetropia
a.short sightedness
b.long sightedness
b.long sightedness
cornea shaped more like a rugby ball than a football
a.wet macula degeneration
b.acute glaucoma
c.chronic glaucoma
d.horners syndrome
e.cataracts
f.astigmatism
f.astigmatism
what happens to the cornea during any corneal pathology
goes cloudy
one function is to stay clear
where does the most refraction of light occur
a.lens
b.cornea
c.sclera
d.retina
e.pupil
b.cornea
which layer of the cornea gives strength and protection
a.epithelium
b.bowmans layer
c.stroma
d.descemets membrane
e.endothelial
b.bowmans layer
which layer of the cornea maintains transparency
a.epithelium
b.bowmans layer
c.stroma
d.descemets membrane
e.endothelial
c.stroma
which layer of the cornea maintains the endothelial cells
a.epithelium
b.bowmans layer
c.stroma
d.descemets membrane
e.endothelial
d.descemets membrane
what colour does the fluorescent orange drip show under blue light when a corneal abrasion is present
a.orange
b.red
c.pink
d.blue
e.green
e.green
which muscle constricts the pupil
a.sphincter pupillae
b.dilator pupillae
c.cilliary muscles
a.sphincter pupillae
which muscle relaxes the pupil
a.sphincter pupillae
b.dilator pupillae
c.cilliary muscles
b.dilator pupillae
the sphincter pupillae is supplied by which system
a.parasymathetic
b.sympathetic
a.parasymathetic
the dilator pupillae is supplied by which system
a.parasymathetic
b.sympathetic
b.sympathetic
In Horners syndrome the pupils are abnormally small this is due to an interruption in which supply to the eye
a.blood
b.sympathetic
c.parasymathetic
d.nervous
b.sympathetic
interruption in symp supply which would normally enlarge pupil
so unopposed parasympathetic supply and pupils are small
can occur due to different events eg roller coasters/ hyperextension of neck at hairdressers
what determines eye pressure
a.aqueous humour
b.vitreous humour
a.aqueous humour
which part of the eye if filled with aqueous humour
a.anterior to lens
b.posterior lens
a.anterior to lens
what is the correct route for flow of aqueous humor?
produced cilliary bodies
lens-iris gap
out through pupil
iris- cornea gap
trabecular network
where does the blockage of aqueous humor flow occur in acute glaucoma
a.iris and lens
b.iris and cornea
c.cornea and lens
d.trabeculum
a.iris and lens
eye runs out of room
old age and hypermetropia are risk factors for what
a.wet macula degeneration
b.acute glaucoma
c.chronic glaucoma
d.horners syndrome
e.cataracts
f.astigmatism
b.acute glaucoma
old age makes lens bigger
hypermetropia - long sighted light bought to focus behind eye so eye too small and pressure builds easier
which of these is a risk factor for acute glaucoma along with old age
a.myopia
b.astigmatism
c.cataracts
d.horners syndrome
e. hypermetropia
e. hypermetropia
eye too small so pressure builds quicker
where does the resistance to flow occur in chronic glaucoma
a.iris and lens
b.iris and cornea
c.cornea and lens
d.trabeculum
d.trabeculum
risk factors - diabetes and steroids
which drug type increase the risk of chronic glaucoma
a.antibitoics
b.steroids
c.antihistamines
d.diuretics
e.beta blockers
b.steroids
diabetes and steroids are risk factors for which eye condition
a.wet macula degeneration
b.acute glaucoma
c.chronic glaucoma
d.horners syndrome
e.cataracts
f.astigmatism
c.chronic glaucoma
imbalance between rate of production and drainage of aqueous humor causing raised intraocular pressure
glaucoma
age related reduction in ability to accommodate
mainly due to lens stiffness
presbyopia
flashers seen is caused by what collapsing in on itself and pulling on the retina
a.cornea
b.iris
c.lens
d.vitreous
e.aqueous
d.vitreous
floaters seen are caused by wisps of condensed………….. floating around the eye creating shadows
a.aqueous
b.vitreous
b.vitreous
what should be done for patient with flashers and floaters?
a.nothing
b.bought into gp
c.sent to a and e
b.bought into gp
vitreous can pull enough to tear retina causing retinal detachment
