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Opthal > Orbit > Flashcards

Orbit Flashcards

1
Q

Capacity of orbit?

A

30 cc

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2
Q

Orbit weakest wall?

A

Medial wall

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3
Q

Proptisis if?

A

> 21mm or diff b/ w 2 eyes >2mm

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4
Q

Exophthalmometer used?

A

Hertels ophthalmometer

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5
Q

Ophthalmometer in children?

A

Leuds ophthalmometer

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6
Q

Thyroid Ophthalmopathy mc seen in?

A

Females

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7
Q

Thyroid state in ophthalmopathy?

A

Can be of any state

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8
Q

Proptisis in thyroid opthamopathy mostcommonly ?

A

Unilateral

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9
Q

Order of decompression in thyroid Ophthalmopathy?

A

Medial wall
Inferior wall
Lateral wall

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10
Q

First muscle involved in TO?

A

Inferior rectus

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11
Q

1st movement affected in TO?

A

Elevation

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12
Q

Last muscle involved in TO?

A

Oblique muscle

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13
Q

Test to differentiate paralytic or restrictive squint?

A

Forced duction test

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14
Q

Soft tissue sign in TO?

A

Superior limbic keratoconjunctivitis

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15
Q

Medical managemament of lid sign of TO?

A

Guanethidine eye drops

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16
Q

First sign of cavernous sinus thrombosis?

A

6th nerve palsy

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17
Q

Mc type of lacrimal gland tumor?

A

Benign

18
Q

Most common malignant type of Lacrimal gland tumor?

A

Adenoid cystic

19
Q

Most dangerous malignant LG tumor?

A

Adenoid cystic

20
Q

Pulsating proptisis causes?

A

Carotico cabernous fistula- MC
Fractured roof orbit
NF-1

21
Q

Intermittent proptosis cause?

A

Orbital varices

22
Q

MC intra orbital tumor in adult?

A

Cavernous hemangioma

23
Q

Mc intra orbital malignant in adult?

A

NHL B type

24
Q

MC intraocular malignant tumor in adult?

A

Choroidal malignant melanoma

Secondaries

25
Q

Optic nerve glioma MC in ?

A

NF -1
Childhood
Females

26
Q

CT finding in Optic nerve glioma?

A

Fusiform enlagement of optic nerve

27
Q

MC pathological type of ON glioma?

A

Pilocytic astrocytoma

28
Q

Mc age presentation of RB?

A

18 mnths/ <3 years

29
Q

Second mc mode of presentation of RB?

A

Squint

30
Q

IOC o f RB?

A

MRI- for penialoma

31
Q

Xray view in RB?

A

Rhese view for optic foramen

32
Q

Mc mode of spread of RB?

A

Optic nerve

33
Q

Aquous humor enzymes raised in RB?

A

LDH
PGI
NSE

34
Q

Micro findings of differentiated RB?

A

Homer wright
Flexner wintersteiner
Fluorette

35
Q

Genetic mutation in RB?

A

13q 14

36
Q

13q syndrome?

A

RB + dysmorphic features

37
Q

Trilateral RB?

A

Bilateral RB + penialoma

38
Q

Mc extraocular cancer associated with hereditary RB?

A

Osteosarcoma

39
Q

Size of RB for laser photocoagulation and cryotherapy?

A

<3mm

40
Q

Chemo for RB?

A

Carboplatin
Vincristine
Etoposide

41
Q

MC cause of leucocoria?

A

congenital cataract

Opthal (4 decks)

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