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NS1NS1 > Ophthalmology - BB Quiz > Flashcards

Ophthalmology - BB Quiz Flashcards

1
Q

The thickest layer of the cornea is the:

endothelium

epithelium

Descemet’s layer

stroma

Bowman’s layer

A

Stroma

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2
Q

The weakest area of the sclera is at the:

muscle insertions

lamina cribrosa

equator

lamina fusca

limbus

A

lamina cribosa

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3
Q

Which statement about the limbus is false?

most of the aqueous passes into the canal of Schlemm by passive transport

collector channels and aqueous veins drain aqueous from the canal of Schlemm

the scleral spur is attached to the trabecular meshwork and the ciliary muscle

trabeculae of the trabecular meshwork thicken with advancing age

uveoscleral outflow is the main route by which aqueous leaves the eye

A

uveoscleral outflow is the main route by which aqueous leaves the eye

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4
Q

The sphincter pupillae is found in the:

collarette

pars plicata

pars plana

iris stroma

iris epithelium

A

iris stroma

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5
Q

Which statement about the lens is true?

lens sutures are inverted anteriorly

ciliary muscle contraction increases zonular tension during accommodation

the nucleus has a lower refractive index than the cortex

varying capsule thickness governs lens shape during accommodation

glucose enters the lens by active transport

A

varying capsule thickness governs lens shape during accommodation

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6
Q

Which statement about the vitreous is false?

the cortex contains phagocytic hyalocytes

the normal vitreous is not optically empty

Cloquet’s canal carries blood vessels that nourish the adult vitreous

vitreous syneresis is normal

the weakest vitreous attachment occurs at the disc margin

A

Cloquet’s canal carries blood vessels that nourish the adult vitreous

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7
Q

Which statement about the retina is true?

tight junctions in the retinal pigment epithelium form a blood-retinal barrier

cones are most dense in the mid periphery

parvo-cellular receptive fields are sensitive to contrast and motion

cone:bipolar cell ratios tend to be larger that rod:bipolar cell ratios

the neural retina is strongly attached to the retinal pigment epithelium

A

tight junctions in the retinal pigment epithelium form a blood-retinal barrier

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8
Q

Beta blockers used in glaucoma therapy act upon:

tight junctions

adenylate cyclase

carbonic anhydrase

the sodium potassium pump

blood vessels

A

Adenylate cyclase

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9
Q

Lens fibres are produced by the:

nucleus

capsule

epithelium

cortex

stroma

A

Epithelium

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10
Q

Partial decussation of nerve fibres occurs in the:

optic tract

chiasm

optic radiation

visual cortex

lateral geniculate nucleus

A

chiasm

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11
Q

The bulk of vitreous gel is made up of all except:

hyaluronic acid

ascorbic acid

chondroitin sulphate

opticin

elastic fibres

A

elastic fibres

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12
Q

The main refractive component of the eye is the:

aqueous humour

cornea

crystalline lens

pupil

retina

A

Cornea

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13
Q

The main retinal sign of arteriosclerosis is:

broadening of arteriolar reflex

reduced arteriovenous ratio

cotton wool spots

exudates

arteriovenous nipping

A

arteriovenous nipping

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14
Q

The tissues of the eyeball do not include:

irregular dense connective tissue

stratified squamous epithelia

regular dense connective tissue

cartilage

simple squamous epithelia

A

cartilage

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15
Q

Which bone is only found in the roof of the orbit?

sphenoid

ethmoid

frontal

zygomatic

maxilla

A

frontal

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16
Q

Which is the name for drug induced deposits in the corneal epithelium?

blebs

vortex keratopathy

bedewing

polymegathism

guttae

A

vortex keratopathy

17
Q

Which statement about aqueous production is false?

parasympathetic regulation of adenylate cyclase alters ion transport

carbonic anhydrase generates bicarbonate ions

the sodium potassium pump transports sodium out of the epithelium

blood plasma leaks into the stroma of ciliary processes

the ciliary epithelium absorbs blood plasma

A

parasympathetic regulation of adenylate cyclase alters ion transport

18
Q

Which statement about corneal signs is false?

flourescein dye stains areas of missing epithelium

oedema that occurs after sleep usually subsides 4 hours after waking

fluid inclusions typically exhibit ‘reversed’ illumination

acidosis is caused by hypercapnia and hypoxia

defective hemidesmosomes are responsible for recurrent epithelial erosion

A

fluid inclusions typically exhibit ‘reversed’ illumination

19
Q

Which statement about retinal signs is false?

cilioretinal arteries may protect the papillo-macular bundle

flame and dot haemorrhages are a sign of occlusion of the retinal arterioles

diabetes and hypertension can cause blood vessel tortuosity

cotton wool spots are caused by ischemia

the appearance of a macular star is explained by fibres of Henlé

A

flame and dot haemorrhages are a sign of occlusion of the retinal arterioles

NS1NS1 (20 decks)

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