ABO NOCE Basic Opticianry Dispensing Instrumentation 2

Question 1

A lensometer measures which of the following properties of an ophthalmic lens?

Accepted Answer

Vertex power, axis, and prism

Answer

Lens thickness and weight

Answer

Frame PD and segment height

Answer

Base curve and lens diameter

Question 2

When using a manual lensometer to neutralize a single vision lens, which target appearance indicates the lens is properly focused?

Accepted Answer

Clear, stationary lines with the mires centered

Answer

A blurred circle of light

Answer

Rotating mire lines

Answer

A split image that cannot be merged

Question 3

The pupillary distance (PD) ruler is used primarily to measure which distance?

Accepted Answer

The horizontal distance between the patient's pupil centers

Answer

The distance from the cornea to the back of the lens

Answer

The vertex distance of the frame

Answer

The segment height of a bifocal lens

Question 4

Which instrument is specifically designed to measure the curvature of a contact lens or the base curve of a spectacle lens?

Accepted Answer

Radiuscope / lens clock

Answer

Lensometer

Answer

Pupillometer

Answer

Distometer

Question 5

The distometer is used in opticianry to measure which parameter?

Accepted Answer

The vertex distance between the back of the lens and the cornea

Answer

The optical center height of a bifocal

Answer

The interpupillary distance

Answer

The lens diameter before edging

Question 6

A pupillometer differs from a PD ruler in that it:

Accepted Answer

Uses a light reflection from the cornea for more accurate monocular PD measurement

Answer

Measures corneal curvature instead of pupil distance

Answer

Can only measure distance PD, not near PD

Answer

Is used exclusively for children

Question 7

When using a frame warmer (hot air blower) to adjust a plastic frame, the primary goal is to:

Accepted Answer

Soften the acetate to allow adjustment without cracking

Answer

Permanently reshape the frame without the risk of breakage

Answer

Sterilize the frame before dispensing

Answer

Shrink the frame to a smaller size