Corneal Optics

Question 1

Cornea has about (fraction) of the total power of the eye

Answer 1

2/3

Question 2

Corneal power is approximately:

Answer 2

42 D

Question 3

Refractive index of cornea is:

Answer 3

1.337

Question 4

Central thickness of cornea:

Answer 4

0.5mm

Question 5

RI of aqueous humor

Answer 5

1.336

Question 6

True or false: cornea is a spherical surface

Answer 6

False

Question 7

Cornea is regarded as a _______, and the blank is __________

Answer 7

Conicoid

Ellipsoidal

Question 8

Anterior corneal sphericity values (Q) are usually ________, which indicates the cornea _______ away from the vertex

Answer 8

Negative

Flattens

Question 9

Q value required to eliminate spherical aberration at the anterior surface is:

Answer 9

-0.528

e=0.73

Question 10

Corneal diameter is from:

Answer 10

Limbus to limbus

Question 11

Horizontal diameter in adults is:

Vertical is:

Answer 11

11mm

12mm

Question 12

Hyperboles tend to be ______ than myopes

Answer 12

Flatter

Question 13

Cornea too curved is______

Too flat is ______

Answer 13

Keratoconus

Cornea plana

Question 14

A thin cornea leads to _______________ of IOP

Answer 14

Underestimation