Quiz 2

Question 1

The area of the cornea with the steepest curvature is the ____ .

a. Geometric Center
b. Limbus
c. Apex.
d. Visual Center

Answer 1

c. Apex

Question 2

The following Keratometer readings indicate what type of Astigmatism? 43.00@145 / 41.00@055

a. Against The Rule
b. Irregular
c. Oblique
d. With The Rule

Answer 2

c. Oblique

Question 3

The following Keratometer readings indicate what type of Astigmatism? 45.00@020 / 46.00@110

a. With The Rule
b. Oblique
c. Irregular
d. Against The Rule

Answer 3

a. With The Rule

Question 4

The Keratometer is designed to measure the cornea at the ____ ?

a. Apex
b. Visual Center
c. Geometric Center
d. Limbus

Answer 4

b. Visual Center

Question 5

If a patient’s “K” readings are 46.00@180 / 43.75@090 the measurable corneal astigmatism is ____ diopters.

a. 3.75
b. 0.75
c. 2.25
d. 1.25

Answer 5

c. 2.25

Question 6

A ____ lens may be used to extend the range of the Keratometer from 52.00 to 61.00

a. -1.00
b. +1.00
c. +1.25
d. -1.25

Answer 6

c. +1.25

Question 7

Given the following information calculate the residual Astigmatism (CRA) if the patient is fit with a rigid C.L. :

Rx +6.00 +0.25 x080
Ks 42.25 / 43.75 @080

a. 1.75D
b. 1.25D
c. 1.50D
d. 0.25D

Answer 7

b. 1.25D

Question 8

The topographer ___________ ?

a. Is a Keratometer attachment designed to help locate the apex
b. Provides a computer generated map of corneal curvature
c. Is used to measure contact lens power
d. Is used to measure a contact lens diameter

Answer 8

b. Provides a computer generated map of corneal curvature

Question 9

Before using any Keratometer it is necessary to:

a. Lock the instrument position
b. Rotate the drum
c. Focus the mires
d. Focus the eyepiece

Answer 9

d. Focus the eyepiece

Question 10

Given the following information calculate the residual Astigmatism (CRA) if the patient is fit with a Rigid CL :

Rx -2.00 -1.50 x180
Ks 41.50 / 43.25 @090

a. 1.75D
b. 3.25D
c. 1.50D
d. 0.25D

Answer 10

d. 0.25D