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Sample MCQs > Eyedocs Flagged corrections > Flashcards

Eyedocs Flagged corrections Flashcards

1
Q

Thickness of cornea

A

Central 0.5-0.6mm
Peripheral 0.6-0.8mm

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2
Q

How to work out power of CL

A

f(CL) = f(glasses) - vertex distance

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3
Q

Which puctum is more medial?

A

Superior punctum is more medial

Inferior pucutm is more lateral

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4
Q

What tumour impairs olfaction

A

Meningioma below frontal lobe - olfactory groove meningioma

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5
Q

What is the grey line

A

Mucocutaneous junction - outer keratinised skin squamous epithelium

Stratified columnar epithelium of tarsal conjunctiva

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6
Q

Where is occulomotor nerve in relation to optic chiasm?

A

LAteral to chiasm

Chiasm is inferior to olfactory tract
Floor of recess of third ventricle

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7
Q

Where are touton cells seen

A

Juvenile xanthogranoloma

Recurrent hyphema from iris
Yellow orange papules on skin

Touton cells are fusion of epithelioid cells (macrophages) with nuclei surrounded by foamy cytoplasm

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8
Q

What does working distance of 2/3m indicate in retinoscopy

A

-1.5D power

0.5m is -2D power

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9
Q

After cycloplegia do you need stronger or weaker convex lenses

A

Stronger convex lenses because of indeced hypermetropia of eye from loss of ciliary tone

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10
Q

What is effect of against the rule astigmatism on convex lenses

A

Horizontal meridian of cornea is steeper
For hypermetropic eye, less plus required for horizontal meridian so horizontal meridian reflex neutralised first as plus increased

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11
Q

Tumour suppressor genes

A

P53
Rb
APC
VHL
P16
BRCA

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12
Q

Oncogenes

A

abl
bcl
hox11
c-myc
ras
ret

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13
Q

Enzyme for O2 radical to O2 and H2O2

A

Superoxide dismutase

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14
Q

Enzyme for H2O2 to H2o +O2

A

Catalase

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15
Q

Enzyme for H2O2 to GSSG and H2O

A

GSH peroxidase

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16
Q

What is the origin of inferior oblique

A

Maxillary bone just lateral to the nasolacrimal canal

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17
Q

What is Sampaolesi’s line

A

Pigmentation anterior to Schwalbe’s line in pigment dispersion syndrome and pseudoexfoliations

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18
Q

Power in relation to image length and object length

A

Power = 1/f2 = 1/i - 1/o

Note object length will be negative as you need to travel back from lens to get to it

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19
Q

Which bone is catilaginous in origin?

A

Ethmoid

The rest are membranous

20
Q

AC depth

A

3.1mm

21
Q

Which cranial nerve passes through petrous temporal bone

A

Facial

22
Q

Map dot fingeprint dystophy histology

A

Duplication of BM
Fibrillary materail between basement membrane and Bowman’s layer

23
Q

What does off centre on surround ganglion cells do?

A

Stimulation of central photoreceptors is inhibitory
Stimulation of peripheral photoreceptors is excitatory

24
Q

Where are anterior and posterior ethmoidal foramina located?

A

Along frontoethmoidal suture in midorbit

Anterior 0 anterior ethmoidal artery, vein and nerve to anterior and middle ethmoidal cells, fortnal cinsu and anterosuperior lateral nasal wall

Posterior - Posteiror ethmoidal artery, vein and nerve which supply PES, sphenoid sinuses

25
Q

What is hamartoma? Vs choristoma

A

Tissue found at site growing in disorganised mass

Choristoma - normal tissue in abnormal location
NORMISTOMA normal tissue abnormal locations e.g. dermoid

26
Q

Treatment for CMV retinitis

A

Oral Gancyclovir

27
Q

Which part of corneal stroma is stronger

A

Anterior - has most thinner and interwoven collagen fibres

28
Q

Which area of retina is perfused last in prem infant?

A

Temporal is perfused last - ischaemic retinal growth factors are produced that drive new abnormal vessel formation

29
Q

What is against motion with strek oriented at 90 degrees

A

There is myopic astigmatism in the 180 degree meridian

Streak oriented at 90 assesses horizontal meridian

Streak orientated at 180 assesses vertical meridian

30
Q

What to do with working distance

A

Power is 1/working distance in m

You should subtract this power from the lens infront of eye

31
Q

What is the active form of acanthomeoba

A

Trophozoite active stage
Cyst is inactive

32
Q

What is normal stereoacuity

A

60 seconds of arc

Better = smaller

250 seconds of arc excludes amblyopia

33
Q

What chromosome is p53 located on

A

17

34
Q

Where is scleral rupture most common?

A

At the limbus

35
Q

Ocular effects of tamoxifen

A

White retinal crystals
CMO maculopathy

36
Q

Sympathetic fibres to iris dilator come from?

A

Superior cervical ganglion

37
Q

Epithelium of lacrimal canaliculi

A

Stratified squamous non keratinised

38
Q

What % of tears through lower punctum

A

70%

39
Q

An object is placed 50 cm from a -10.00D lens. Image distance form lens?

A

-10 = (1/image distance in m) – (1/-0.50)

-10 = (1/image distance in m) + 2

1/image distance in m = -12

image distance in m = -1/12 = -0.0833m = 8.33cm to the left of the lens

To determine magnification we use the equation:

Magnification, M = image size/object size = image distance/object distance (Cartesian convention)

40
Q

A patient wears the following prescription:

OD: - 1.00/ + 2.00 x 180
OS: - 2.50/ + 1.00 x 90
Add + 3.00DS OU

His bifocal segment is located 10 mm inferior to the optical center of the glasses. How much relative prism is induced when he looks through the top of his bifocal?

A

Prentice’s rule is used to calculate the prismatic effect of the lenses acting in the 90° meridian

OD: (+ 1.00 D) x (1.0 cm) = 1.00PD Base-up
OS: (- 2.50 D) x (1.0 cm) = 2.50PD Base-down

Combining the prisms results in 3.50PD base-up over the right eye.

41
Q

What happens when convex spherical lens is placed in material of higher refractive index?

A

Diverges parallel light

42
Q

Indirect ophthalmoscopy through small pupil?

A

Examiner move head away from lens

43
Q

Effect of increasing base curve on power of negative lens?

A

Increases power of negative lens

44
Q

Keratin-filled cavity within the dermis lined by keratinized stratified squamous epithelium.

A

Epidermoid cyst

45
Q

Which bones catilaginous in origin?

A

Ethmoid
Maxilla

46
Q

Where is vitreous most firmly attached

A

At the vitreous base

Sample MCQs (20 decks)

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