These dimensions describe the volume, height, width, depth of the bony orbit
What are:
Interorbital distance: 25 mm Volume: 30 cc Height: 35 mm Width: 40 mm Depth: 40-45 mm
200
A protuberance of this bone, the Whitnall tubercle serves as the attachment to 5 structures
(Bonus: Name the 5 structures)
What is the zygomatic bone?
Check ligament of the lateral rectus muscle Suspensory ligament of Lockwood Lateral palpebral ligament Aponeurosis of the levator muscle
200
Not so fast! Aqueous flow through the trabecular meshwork is rate-limited by this segment
What is the juxtacanalicular (endothelial) meshwork?
200
This unfortunate ethnic group carries a higher risk of having syndromes such as Gaucher, Riley-Day, and Tay-Sachs
Who are Ashkenazi Jews?
200
The variation in severity of the phenotype of genetic conditions such as incontinentia pigmenti is theorized to be due to this phenomenon, named after its discoverer
What is lyonization?
300
These dimensions may be a "drain," but there's no need to cry about it
What are:
Vertical portion of canaliculi: 2 mm Horizontal portion of canaliculi: 8 mm Height of lacrimal sac: 10 mm Nasolacrimal duct: 18 mm Inferior meatus: 20 mm
300
These are the bones that make up the orbit
What are the sphenoid, ethmoid, lacrimal, frontal, palatine, maxillary, and zygomatic bones?
300
The vitreous is firmly attached in these 5 locations
What are the:
Vitreous base (2.0 mm anterior and 4.0 mm posterior to the ora serrata) Optic disc margin Macula Retinal vessels Periphery of the posterior lens capsule
300
Certain corneal disorders such as cornea plana and primary systemic amyloidosis are seen more frequently in this people group
Who are Finnish people?
300
Due to a defect in DNA repair, Xeroderma pigmentosa is associated with a high risk of this condition on the ocular surface
What is squamous cell carcinoma?
400
The normal vertical and horizontal diameters of this "corny" segment of the eye are important for recognizing pathologic states
What are:
Corneal height: 11 mm Corneal width: 12 mm
400
This meaty structure is the site of drainage for the nasolacrimal duct
What is the inferior meatus?
400
Not to be confused with the vitreous attachments to the retina, the uveal tract has attachments to the sclera in these locations
What are the:
Scleral spur Optic disc Vortex veins
400
While this island nation may be better known for their electronics and anime, conditions such as Oguchi disease and Vogt-Koyanagi-Harada syndrome are also found more frequently in this population
What is Japan?
400
Also known as carotenoids, two xanthophylls, lutein and zeaxanthin, are present in the macula in this retinal layer
What is the outer plexiform layer (nerve fiber of Henle)?
Zeaxanthin is primarily found in the macula Lutein is found throughout the retina
500
These types of collagen are all found in corneal stroma
What are types I, III, V, and VI?
500
The only extraocular muscle that does not originate from the orbital apex, the inferior oblique muscle arises instead from this bone
What is the maxilla? (Anteromedially near lacrimal fossa)
500
This extraocular muscle arises from the lesser wing of the sphenoid
What is the levator palpebrae superioris
500
Albinos from this Caribbean land may bleed more easily; a condition known as Hermansky-Pudlak syndrome
What is Puerto Rico?
500
This X-linked dominant condition is associated with agenesis of the corpus collosum