Opthamology I: Orbit, Eyelid, and Lacrimal Systems

Question 1

What bones compose the orbital floor?

Answer 1

palatine, maxillary and zygomatic

Question 2

What is the clinically weakest area in the orbit?

Answer 2

Orbital floor

Question 3

Medial wall bones

Answer 3

SMEL: Sphenoid (lesser wing), maxillary, ethmoid, lacrimal

Question 4

What is the thinnest area of the orbit?

Answer 4

Medial wall

Question 5

Orbital roof bones

Answer 5

Frontal, lesser sphenoid wing

Question 6

Lateral wall

Answer 6

Great-Z: Greater sphenoid wing and zygomatic

Question 7

What is the thickest wall in the orbit?

Answer 7

Lateral

Question 8

Oculocardiac reflex

Answer 8

Bradycardia, asystole, and arrhythmia when pushing or pressure on intraocular muscles or eye

Question 9

Most commonly affected areas with orbital fractures

Answer 9

Medial wall and floor

Medial infraorbital canal is most common

Question 10

When to repair an orbital fracture?

Answer 10

Repair within 2-4 weeks if enophthalmos, incarcerated muscle/orbital tissues, or if >50% of wall fractured

Question 11

Nasolacrimal duct obstruction

Answer 11

Dacryocystistis

Infection of lacrimal sac

Treat with antibiotics

When infection is resolved, treat with surgical bypass surgery