ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers 3

Question 1

The minimum fitting height for a lined bifocal segment is typically measured from:

Accepted Answer

The lower lid margin to the bottom of the frame

Answer

Bifocal segment height is measured from the lower eyelid margin to the bottom of the lens (or frame groove), ensuring the segment line aligns properly.

Question 2

A patient's spectacles show excessive 'four-point touch' contact on the face. This indicates:

Accepted Answer

The frame is too wide and requires endpiece adjustment

Answer

Four-point touch at the temples and nose simultaneously with the frame bowing in the middle indicates the frame is too wide for the patient's face.

Question 3

Which lens material has the highest Abbe value, resulting in the least chromatic aberration?

Accepted Answer

CR-39 plastic (n=1.498)

Answer

CR-39 has an Abbe value of approximately 58, the highest among common ophthalmic lens materials, giving the least chromatic aberration.

Question 4

When a patient reports that glasses feel tight on one side of the head only, the optician should first check:

Accepted Answer

The facial symmetry and temple alignment

Answer

Unilateral tightness often results from unequal temple spread or the patient's facial asymmetry requiring one temple to be adjusted differently.

Question 5

In the boxing system, the 'datum line' is:

Accepted Answer

The horizontal line through the geometric center of the lens

Answer

The datum line is the horizontal line passing through the geometric center of the lens, used as the reference for vertical measurements in the boxing system.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers 3