Quiz (Corneal Dystrophies, Keratokonus, Lens and Cataracts, and Refractive Surgery) Flashcards Preview

II. Anterior Segment Disease > Quiz (Corneal Dystrophies, Keratokonus, Lens and Cataracts, and Refractive Surgery) > Flashcards

Flashcards in Quiz (Corneal Dystrophies, Keratokonus, Lens and Cataracts, and Refractive Surgery) Deck (40)
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1

What are traits that nearly all corneal dystrophies follow?

1. non-inflammatory
2. bilateral
3. hereditary
4. central corneal involvement

2

What is the procedure that uses a needle to puncture the cornea, allowing for a new basement membrane formation?

anterior stromal puncture

3

What is the keratoplastic surgery in which all 5 layers are removed? 1. What is the one in which only some are removed? 2

1. penetrating keratoplasty
2. lamellar keratoplasty

4

What is the procedure used to transplant an endothelium?

DSEAK (Descemet Stripping automated endothelial keratoplasty)

5

What are the complications of DSEAK? 1. What are the advantages? 2

1. posterior graft dislocation
2. less post-op astigmatism, faster recovery

6

What are parallel lines that are deep in the posterior stroma that run parallel with the axis of the cone and disappear with pressure called?

Vogt's striae

7

What is the sign that is a V shaped lower lid conformation when the patient looks in downgaze?

Munson sign

8

What is the keratoconus sign that has an oil droplet appearance with retroillumination?

Charleaux sign

9

What is the treatment for keratoconus where half circles of PMMA are place into the midstroma for better vision?

Intacs

10

What is done to the cornea in corneal cross linking?

1. some epithelium removed
2. Riboflavin added
3. UVA rays applied
4. increase in collagen cross linking

11

What are the requirements in Germany to perform cross linking?

1. >17yo
2. keratoconus or ectasia
3. progression in last year
4. >400um corneal thickness
5. keratometry readings

12

What is the procedure for keratoconus in which the opaque scarred cornea is replaced with clear donor cornea?

penetrating keratoplasty

13

In penetrating keratoplasty what is used to cut the donor button?

trephine

14

What are the possible side effects of penetrating keratoplasty?

1. persistent epithelial defects
2. wound leak
3. shallow anterior chamber
4. iris prolapse
5. uveitis
6. inc IOP
7. Infection
8. Graft rejection

15

What is seen when there is a graft rejection following a penetrating keratoplasty?

Khodadoust line

16

What is a removal of the epithelium and anterior stroma called?

lamellar keratoplasty

17

What is a removal of the eopithelium and all stromal tissue called?

deep lamellar keratoplasty

18

What do high blood sugar levels do to the vision of a diabetic patient? 1. Low sugar? 2

1. inc myopia
2. inc hyperopia

19

What is the leading cause of blindness worldwide?

cataracts

20

What are the prevalence percentages for each of these age groups: 1. 52-64? 2. 65-74? 3. 75-85?

1. 42%
2. 60%
3. 91%

21

What types of cataracts are found to be in more african americans?

cortical/nuclear

22

Are men or women more likely to have a cataract?

women

23

What are the medical risk factors associated with cataracts?

1. diabetes
2. family history
3. medications

24

What nutritional addition can help lower prevalence of cataracts?

B vitamins

25

What are the possible causes of a traumatic cataract?

1. concussion
2. ionizing radiation
3. electric shock
4. lightning

26

What are the different types of cataracts that can occur from a concussion?

1. Vossius ring from iris
2. flower-shaped
3. penetrating

27

What wavelengths do yellow cataract absorb?

low wavelengths so violet and blue

28

What are the medical reasons where cataract surgery must be done and is not just if the patient wants to?

1. reina not visible in a diabetic
2. morgagnian
3. hypermature cataracts

29

What are the things that should be done in all pre-operative cataract surgery appointments?

1. symptoms
2. best corrected VA (lights on and off)
3. Amsler grid
4. SLE, IOP, fundus evaluation
5. Optical coherence (OCT)
6. Glare (BAT)
7. IOL power calculation
8. macular integrity

30

What is used to test the affect of glare on VAs?

Brightness acuity test (BAT)