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

Prism displaces images toward the apex, so base-up prism causes the image to appear displaced downward (toward the apex, which is down).

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

ANSI Z80.1 requires a minimum center thickness of 1.0 mm for most dress eyewear lens materials (except glass, which is 2.0 mm).

Question 3

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

Accepted Answer

Above the fitting cross

Answer

In a PAL, the distance zone is positioned above the fitting cross, with the intermediate corridor below and near zone at the bottom.

Question 4

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

Accepted Answer

Monocular pupillary height

Answer

Monocular pupillary height (measured from the lowest point of the frame to the pupil center) determines vertical optical center placement for single-vision lenses.

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

The scissors motion (two reflexes moving in opposite directions) seen on retinoscopy indicates that cylinder is present with an oblique axis.

NOCE - National Opticianry Competency Examination Practice Test

NOCE - National Opticianry Competency Examination Practice Test

NOCE Ophthalmic Optics and Lenses 5