NOCE Ophthalmic Optics and Lenses 5

Question 1

A prism base direction of 'base-up' in the right eye will cause the image seen by that eye to be displaced:

Accepted Answer

Downward

Answer

Upward

Answer

Nasally

Answer

Temporally

Question 2

What is the minimum lens thickness required by ANSI Z80.1 for dress eyewear in most materials?

Accepted Answer

1.0 mm

Answer

2.0 mm

Answer

1.5 mm

Answer

3.0 mm

Question 3

The distance vision zone of a progressive addition lens is located:

Accepted Answer

Above the fitting cross

Answer

Below the fitting cross

Answer

At the fitting cross level

Answer

In the nasal portion of the lens

Question 4

Which measurement determines where to place the optical center of a single-vision lens vertically?

Accepted Answer

Monocular pupillary height

Answer

Fitting height

Answer

Seg height

Answer

Optical center height from the datum line

Question 5

When a minus cylinder lens is held at a distance and rotated, the scissors effect seen with a retinoscope indicates:

Accepted Answer

Oblique cylinder axis

Answer

Spherical power only

Answer

No cylinder present

Answer

Correct axis orientation

Question 6

Polycarbonate lenses require an anti-scratch coating because:

Accepted Answer

The material is inherently soft and scratches easily

Answer

The material is too hard to bond with coatings

Answer

It reacts with UV inhibitors

Answer

Its high index makes it prone to crazing

Question 7

The image formed by a converging lens when the object is placed between the focal point and the lens is:

Accepted Answer

Virtual, erect, and magnified

Answer

Real, inverted, and magnified

Answer

Virtual, inverted, and reduced

Answer

Real, erect, and reduced