ABO NOCE Basic Opticianry Ophthalmic Products and Materials Questions and Answers 5

Question 1

Which frame material requires soldering for repairs and adjustments?

Accepted Answer

Metal frames (monel, stainless)

Answer

Metal frame repairs typically require soldering to reattach broken parts or reinforce stress points, unlike plastic frames which are heat-adjusted or replaced.

Question 2

What is the optical significance of a lens with a higher Abbe number?

Accepted Answer

Less chromatic aberration and better color fidelity

Answer

A higher Abbe value (also called V-value or constringence) means the material disperses light into its color components less, resulting in less chromatic aberration.

Question 3

A patient complains that their new lenses cause rainbows around lights at night. This is most likely caused by:

Accepted Answer

Lens material with low Abbe value causing chromatic aberration

Answer

Chromatic aberration from low Abbe value lens materials causes light to split into rainbow-like color fringing, especially noticeable around point light sources at night.

Question 4

Which lens design feature helps a wearer using digital devices by providing an extended intermediate zone?

Accepted Answer

Office/computer progressive lens

Answer

Office or computer progressive lenses (also called near variable focus lenses) are designed specifically to optimize intermediate and near vision distances for digital device users.

Question 5

What is the recommended minimum center thickness for a polycarbonate lens to meet FDA drop ball impact resistance standards?

Accepted Answer

1.0 mm

Answer

Polycarbonate lenses must have a minimum center thickness of 1.0 mm to meet FDA impact resistance requirements, compared to 2.0 mm for glass and CR-39.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ophthalmic Products and Materials Questions and Answers 5