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Sample MCQs > Blue 3 > Flashcards

Blue 3 Flashcards

1
Q

What is writ fly test and what range of stereoacuity does it test

A

PErformed at 40cm
Tests 3000 to 40 seconds of arc

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2
Q

What stereoacuity may indicate amblyopia

A

Worse than 250 seconds of arc

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3
Q

What do you need to determine prism power

A

Refractive indiex
Refracting angle

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4
Q

Where does the fascial sheath attach to the sclera

A

1.5mm from the corneascleral junction

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5
Q

How wide is sphincter pupillae

A

1mm wide ring of smoothe muscle

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6
Q

What is the diameter of the eye at the end of the embryonic period

A

1.5-2mm

Week 8

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7
Q

What cells produce the glycocalyx

A

Stratified squamous cells of the corneal and conjunctival epithelium

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8
Q

How many photoreceptors interact with one RPE cell

A

23

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9
Q

How long does regenration of rhodopsin occur after dark adaptation

A

30 minutex

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10
Q

What happens in Sickle cell

A

Abdnomral haemoglobin S contains faulty beta chains in haemoglobin molecules

Low oxygen tension promotes sickling
Cell membrane becomes rigid and fragile

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11
Q

How long is PR interval? QR interval

A

PR 0.12-0.2s
QT 0.35s

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12
Q

What is inspiratory reserve volume

A

Amount of ait forcible inhaled after normal tidal volume 3000ml

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13
Q

What is tidal volume

A

Amount of air inhaled during one respiratory cycle

300-500ml

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14
Q

What is residual volume

A

1200ml

Amount of air left in lungs following full force expiration

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15
Q

What is expiratory reserve volume

A

1100ml

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16
Q

What substances can directly excite pain receptors? Which cannot?

A

Bradykinin, serotonin, histamine, acetylcholine, acids, potassium ions, proteolytic enzymes directly excite pain receptors

Prostaglandins and substance P cannot, they enhance sensitivity

17
Q

Which nephrons have shorter looks of Henle

A

Corical nephrons have shorter loops of Henle than juxtamedullary

18
Q

What proportion of nephrons are juxtamedullary

A

20-30%

19
Q

What % of tear film is aqueous layer

A

60%

20
Q

What arteries does GCA involve?

A

Cerebral arteries
Ophthalmic arteries
Posterior ciliary branches
Central retinal arteries

21
Q

Which is worse prognosis epithelioid or spindle cell melanoma

A

Epithelioid

22
Q

What are favourable prognostic factors for uveal melanoma

A

younger patients
Smaller tumours
Chroid location
Spindle cell
Gain in 6p

23
Q

Worse prognosis for uveal melanoma

A

Epithelioid
Older patients
Ciliary body
Monosmoy 3
8q additional copies

24
Q

What causes phayrgoconjunctival fever adenovirus

A

1, 2, 3, 5, 7, 14

25
Q

What causes epidemic keratoconjunctivitis

A

3, 7 ,8 .19

26
Q

What is lysozyme effective againse

A

Gram negative organisms and fungi

Ineffective against gram positive

27
Q

What are SE of beta blockers

A

Bradycardia
Bronchospasm
Syncope
CNS depression

28
Q

What do a1 receptors do?
a2 receptors?
b1 receptors
b2 receptors
b3 receptors

A

a1 - excitatory - SMC contraction

a2 - inhibtiors -

b1 - heart - excitatory

b2 - lungs and vessels - inhibtiory SMC relaxation

29
Q

What visual field defect can be seen in tilted disc syndrome

A

Superior bitemporal field defects
Can cross vertical meridian

30
Q

Filling defect in ICG angiography caused by? Window defect?
Leakage of dye?
Abnormal vessels?

A

Filing defect - Atrophic ARMD

Window defect - RPE defect, macular hole

Leakage - choroidal neovascularisation

Abnormal blood vessels - choroidal haemangioma

31
Q

Ultrasound biomicroscopy frequency compared to normal US

A

Higher frequency transducer

Higher resolution imagin

Less depth penetration

32
Q

What does patient do in EOG

A

Intermittently follows targets moving left to right over 30 degree horizontal plane

33
Q

What is detection bias?

A

Systematic differences between groups on how outcomes are determined

Sample MCQs (20 decks)

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