Refraction, Retinoscopy and Refinement

Question 1

What is the term for the “bending of light”?

A. Dispersion
B. Refraction
C. Emergence
D. Incidence

Answer 1

B. Refraction

Question 2

The area between the two focal points of a spherocylindrical lens is called the Conoid of

A. Schlemm
B. Streit
C. Schiotz
D. Sturm

Answer 2

D. Sturm

Question 3

Visual acuity of 6/12 is equivalent to

A. 20/20
B. 20/30
C. 20/40
D. 20/50

Answer 3

C. 20/40

Question 4

What is the principle reason for the routine preference of subjective over objective refraction?

A. Automated retinoscopy systems make refraction efficient
B. The Jackson cross cylinder is easy to use
C. Spero-cylinder evaluation is easy
D. The patient’s preference is considered in the process

Answer 4

D. The patients preference is considered in the process

Question 5

The fact that most glasses have a downward tilt to minimize the oblique astigmatism is called

A. interpupillary distance
B. pantoscopic tilt
C. oblique astigmatism
D. image displacement

Answer 5

B. pantoscopic tilt

Question 6

What is the result of a loss of accommodation?

A. Myopia
B. Hyperopia
C. Presbyopia
D. Amblyopia

Answer 6

C. Presbyopia

Question 7

What is the ocular structure with the greatest refractive power?

A. Cornea
B. Lens
C. Pupil
D. Retina

Answer 7

A. Cornea

Question 8

What test illuminates the screen with a filter that is red on one side and green on the other?

A. Worth four-dot
B. Ishihara
C. Duochrome
D. Maddox

Answer 8

C. Duochrome

Question 9

The distance from the anterior surface of the eye to the back surface of the spectacle lens is the

A. base curve
B. pupillary distance
C. lens distance
D. vertex distance

Answer 9

D. vertex distance

Question 10

Retinoscopy is an example of what type of refractometry?

A. Objective
B. Subjective
C. Immediate
D. Latent

Answer 10

A. Objective