Lens, Vitreous, And Retina

Question 1

Plateau iris

Answer 1

• aqueous humor obstruction
• iris is flexible so fluid pushes up underneath it causing to to block off the flow of aqueous
• complete angle closure

Question 2

Retinal tear (horseshoe tear)

Answer 2

Vitreous gets pulled and the retina comes with it instead of detaching
-younger people have stronger attachments so they will have larger tears if they happen

Question 3

Retinal tear tears through what part of retina

Answer 3

Through neural retina from the RPE

Question 4

WHAT IS A SEROUS DETACHMENT

Answer 4

Retinal tears away and fluid/vitreous gets in the new (interneural-like) space

• fluid will make the detachment likely to spread
• patient has to walk around very carefully till they have surgery the next morning

Question 5

Preretinal hemorrhage

Answer 5

Between the vitreous and the retina

• blood fills underneath
• usually doesn’t get in macula because the attachment there is strong and did not come undone
• will not flow to other areas of the retina because the attachments are strong

Question 6

Floaters

Answer 6

HA deteriorates and the collagen fibers coalesce and become opaque and cast a shadow

Question 7

What kind of ‘floater’ can you treat with a laser

Answer 7

Worms in the eye

-nematodes

Question 8

Epiretinal membrane (macular pucker)

Answer 8

After aging, the vitreous shrinks and liquifies inside the hyaloid membrane

• pulls away from the retina but does not snap free from it
• wrinkles cause bluriness
• can progress to macular hole

Question 9

Horizontal raphe

Answer 9

Central retina develops first and then the periphery grows and has to course around the central stuff already in place

Question 10

Myelinated nerve fibers

Answer 10

Nerves in eye will not have myelination because its too bulky. Some people born with it in their eye though.
-you can tell its not vasculitis because it does not follow one vessel, it will completely block out the view of the blood vessel and looks white and fluffy

Question 11

A hole in one of the structures of the eye, such as the iris, retina, choroid, or optic disc

Answer 11

Coloboma

Question 12

How does a coloboma form

Answer 12

There is a fissure where embryonic blood vessels course, they eventually disintegrate and the fissure is supposed to close. Sometimes it fails to close and you get a coloboma

Question 13

What are Christmas tree cataracts caused by

Answer 13

Cholesterol or cysteine