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Flashcards in General Deck (16)
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0
Q

3 structures posterior to the septum

A
  • palpebral lobe of lacrimal gland
  • lateral canthal tendon
  • trochlea of SO
1
Q

Silicone oil

A

Band keratopthy
If emulsified: glaucoma, direct effect on endothelium.
Worse in a phakic patients.

Know that there are 2 types of viscosity to the oil (alters calculation)
If traditional a scan ultrasound moves slower and the eyeball will read longer than it is (you’ll need a higher power lens)
Others thibgs: lens choice (calculations, power spericity,

2
Q

What is the arcus marginalis

A

Where septum fuses with peri-orbita at the orbital rim

3
Q

What are the two vascular arcades of the upper lid

A

Marginal arcade: at the eyelid margin
Peripheral arcade: just above the top of tarsus (behind levator, in front of muller –> be careful not to hit it in ptosis repair whn you take a bite through levator!)

4
Q

MRI, T1 is what colour for vitreous and orbital fat?

A

Vitreous dark on T1, bright on t2

Orbital fat is bright on T1, but turns dark with fat suppression (allows you to see optic nerve better)

6
Q

List orbital hamartomas

A

Tumors of tissues NORMALLY found in that location

  • nevus
  • neurofibroma
  • neurilemmoma = schwannoma
  • glioma
  • hemangioma
  • lymphangioma
  • CHHRPE
6
Q

Where is a schwannoma on the eyelid usually?

A

Solitary nodule near medial canthus

7
Q

List orbital choristomas

A

Tumors of tissues NOT normally found there

  • dermoid
  • dermatolipoma
  • ectopic lacrimal gland
  • complex conjunctival choristoma
8
Q

There is a solitary nodular cyst at the lateral canthus. What is it?

A

Hydrocystoma

  • either on lid margin or lateral canthus
  • solitary nodular cyst
  • lined by double row of cuboidal epithelium
9
Q

5 causes of correctopia

A
Trauma
Posterior synechiae (inflammation) 
ICE
Axenfeld reiger
Ectopia lentis et pupilae
10
Q

Differential of congenital hypochromic iris

A

Wardenburg
Horner’s
Hirschprung
Parry Romberg hemifacial atrophy

11
Q

Congenital unilateral hyperpigmented iris

A

Ocular or oculodermal melanocytosis

Iris pigment epithelial hamartoma

12
Q

When do you see a Kayser Fleischer ring

A

Wilson’s disease
Chalcosis (foreign body)
Multiple myeloma
Lung carcinoma

13
Q

What is the max dose of lidocaine you should use

A

5 mg/kg no epi , max dose 300 mg

7 mg/kg with epi, max 500 mg

14
Q

DDx of intra-ocular calcium

A
Phthisis
RB, retinocytoma
ONH drusen
Choroidal osteoma
Choroidal hemangioma
Retinal astrocytoma
15
Q

DDx of intra-ocular cartilege

A

Trisomy 13
Medulloepithelioma
PHPV