Keratometry

Question 1

What type of corneal astigmatism does a keratometry reading of 42.25/44.75×90 indicate?

A. None
B. Oblique
C. With – the – rule
D. Against – the - rule

Answer 1

C. With - the - rule

Question 2

The purpose of keratometry is to measure the

A. Thickness of the corneal stroma
B. Curvature of the anterior corneal surface
C. Diameter of the horizontal cornea
D. Diameter of the vertical cornea

Answer 2

B. Curvature of the anterior cornea surface

Question 3

Which process is useful for measuring corneal astigmatism?

A. Lensometry
B. Keratometry
C. Tonometry
D. Biometry

Answer 3

B. Keratometry

Question 4

The results of keratometry can be expressed in

A. Cubic mm.
B. mm Hg
C. Centimeters
D. Diopters

Answer 4

D. Diopters