Exam 2: Ophthalmology Flashcards Preview

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Flashcards in Exam 2: Ophthalmology Deck (48)
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1

 A condition in which the eyelid (usually the lower lid) folds inward. It is very uncomfortable, as the eyelashes constantly rub against the cornea and irritate it

Entropion

2

How is entropion treated?

Inject saline into eyelid and suture

with simple interrupted sutures

3

A full-thickness defect in the eyelid

Eyelid coloboma

4

What type of surgical technique is used for

removal of squamous cell carcinoma near the eye?

Sliding Flap technique and Burow's triangles

5

There are no blood vessels in a normal healthy ______

cornea

6

Corneal stroma is made of collagen

arranged in a _______ fashion

to make it transparent

parallel

7

Name the layers of the cornea from outermost to innermost

Tear film

Corneal epithelium

Corneal stroma

Descemet's membrane

Endothelium

8

This layer of the cornea is the thickest

and is composed of collagen arranged in a parallel manner

Corneal stroma

9

The innermost layer of the cornea,

the endothelium is _____ layer thick

1

10

Inflammation of the cornea is known as

Keratitis

11

What are the clinical signs of keratitis (corneal inflammation)?

Blepharospasm

Epiphora

Corneal edema

Corneal opacity

12

What type of block can you use to

inhibit blepharospasm in a horse?

Infraorbital block of the frontal nerve

13

Squinting of the eye due to pain is known as

blepharospasm

14

Why does the eye appear cloudy when corneal edema is present?

fluid in the stromal area causes collagen fibers to

be disorganized, resulting in the cloudy appearance

15

What test is used to diagnose keratitis?

Fluorescein test

16

What layer of the cornea is stained with

the fluorescein test?

Stroma

17

In normal corneal healing,

the cornea heals via this mechanism

Cell Sliding

18

Why does a corneal ulcer form?

Bacteria invade an epithelial defect in the cornea

causing tissue destruction and eventually

corneal perforation

19

What can the pattern of corneal vascularization tell you?

Depth of corneal ulcer

20

If you see corneal vascularization in a

circular or branching pattern,

how deep is the ulcer?

Superficial

21

What type of corneal vascularization pattern

do you expect to see in cases of a deep ulcer?

STRAIGHT pattern

22

Upon corneal inspection, you see

anastomosis of circular branching patterns and straight patterns

in corneal vascularization.

What does this tell you?

The problem is CHRONIC

23

________ swabs are used to culture

infections of the cornea

because cotton swabs have enzymes that can

mask some infections

synthetic

24

What surgical technique is used to treat 

and undermined/deep corneal ulcers

after swabbing and trimming with a curette?

Conjunctival pedicle flap

brings more blood vessels to the area to help heal

25

You see an opacity and stain it with fluorescein, but there

is no uptake of the dye. The epithelial surface is uneven.

What is your dx?

Stromal Infection

26

What causes an iris prolapse (Staphyloma)?

An infection that is too deep ruptures into the anterior chamber.

The iris washes anteriorly, meaning it is pulled

against the cornea to plug the hole.

NEVER TOUCH THE IRIS- bleeds profusely

27

an inflammatory condition of the intraocular cavities (ie, the aqueous and/or vitreous humor) usually caused by infection

Endophthalmitis

28

How is Endophthalmitis treated?

exenteration of the eyeball (complete removal)

29

Lens luxation occurs when the lens capsule separates 360° from the zonules. This can eventually lead to

_________ formation

cataract

30

How is lens luxation treated?

Lens extraction