FREE CPO Keratometry and Corneal Topography Questions and Answers

Question 1

A keratometer is an instrument used to measure the:

Accepted Answer

Curvature of the central cornea

Answer

Intraocular pressure

Answer

Axial length of the eye

Answer

Thickness of the cornea

Question 2

In 'with-the-rule' astigmatism, the steepest corneal meridian is located at or near:

Accepted Answer

90 degrees (vertical)

Answer

180 degrees (horizontal)

Answer

45 degrees (oblique)

Answer

135 degrees (oblique)

Question 3

What is the primary advantage of corneal topography over standard keratometry?

Accepted Answer

It provides a detailed map of the entire corneal surface.

Answer

It is faster to perform.

Answer

It can also measure intraocular pressure.

Answer

It does not require the patient to fixate on a target.

Question 4

A patient's K-readings are 43.50 @ 180 / 45.00 @ 090. What is the amount of corneal astigmatism?

Accepted Answer

1.50 D

Answer

0.50 D

Answer

1.00 D

Answer

44.25 D

Question 5

On a standard corneal topography map, 'hot' colors such as red and orange typically represent areas that are:

Accepted Answer

Steeper in curvature

Answer

Flatter in curvature

Answer

Thinner than average

Answer

Affected by scarring

Question 6

If the keratometer mires are blurry and cannot be brought into focus, the most likely cause is:

Accepted Answer

A poor or unstable tear film

Answer

Incorrect instrument calibration

Answer

High intraocular pressure

Answer

A small pupil size