Quiz 1

Question 1

43. 00D horizontal and 44.00D vertical. Which of the following is a correct notation?
44. 00 @ 180 / 43.00D @090
45. 00 x 180/44.00 x 090
46. 00 180 / 44.00 090
47. 00 180 / 44.00 90

Answer 1

43.00 180 / 44.00 090

Question 2

Your pts corneal radii are 43.50D horizontal and 45.50D vertical. What type of astigmatism is that?

Answer 2

With the rule

Question 3

Your pts. flat corneal radius (flat K) is 40.50. What is the equivalent?

Answer 3

8.33 mm

Question 4

Your pts flat K is 51.00D. What condition can this indicate?

Answer 4

Keratoconus

Question 5

Which of the following represents an average cornea?
HVID 11.70mm and VVID 10.60mm
HVID 10.60mm and VVID 11.70mm
HVID 10.70mm and VVID 9.80mm
HVID 9.80mm and VVID 10.70mm

Answer 5

HVID 11.70mm and VVID 10.60mm

Question 6

Which slit lamp illumination technique is used to observe corneal layers (therefore also tearfilm thickness and lens thickness in CL)?
Sclerotic scatter
Conical Beam
Optic Section
Retro-illumination

Answer 6

Optic section

Question 7

What is the appropriate thickness of the corneal epithelium?

Answer 7

50um

Note: Corneal thickeness is 520um

Question 8

Consider corneal layers. What is the order of layers from anterior to posterior?

Answer 8

Epithelium, Bowman’s layer, Stroma, Descemet’s membrane, and Endothelium

Question 9

What is the appropriate water content of the cornea?

Answer 9

78%

Question 10

How does the cornea react under oxygen deprivation? (fast reaction)

Answer 10

Edema