ABO NOCE Basic Opticianry ABO NOCE MCQ 3

Question 1

What is the index of refraction of crown glass?

Accepted Answer

1.523

Answer

Standard crown glass has an index of refraction of approximately 1.523, which is the baseline for most optical calculations.

Question 2

Which prism orientation would correct a right hyperphoria?

Accepted Answer

Base down before the right eye

Answer

Right hyperphoria means the right eye deviates upward, so base-down prism before the right eye redirects the image downward to compensate.

Question 3

What is the primary purpose of the distance between lenses (DBL) measurement?

Accepted Answer

To determine the width of the bridge

Answer

DBL (distance between lenses) measures the width of the bridge, which determines how the frame fits across the nose.

Question 4

A prescription of -4.00 DS is ordered in polycarbonate. What is the primary advantage of polycarbonate for this prescription?

Accepted Answer

Impact resistance

Answer

Polycarbonate's primary advantage is its exceptional impact resistance, making it the preferred safety material regardless of prescription power.

Question 5

What does 'vertex distance' refer to?

Accepted Answer

The distance from the back surface of the lens to the cornea

Answer

Vertex distance is the measurement from the back surface (ocular side) of a spectacle lens to the anterior surface of the cornea.

ABO NOCE Basic Opticianry Practice Test