ABO NOCE Basic Opticianry Ophthalmic Products and Materials 4

Question 1

What is the primary advantage of titanium frames over standard metal frames?

Accepted Answer

High strength-to-weight ratio and corrosion resistance

Answer

Titanium offers exceptional strength with very low weight, and it is highly resistant to corrosion and hypoallergenic, making it ideal for sensitive patients.

Question 2

Which of the following best describes an aspheric lens design?

Accepted Answer

A lens with varying curvature that flattens toward the periphery

Answer

Aspheric lenses have a front surface that gradually flattens from center to edge, reducing lens thickness and improving peripheral optical quality.

Question 3

A patient asks about the difference between polarized and standard tinted lenses. The key benefit polarized lenses provide is:

Accepted Answer

Elimination of glare from horizontally reflected light

Answer

Polarized lenses contain a filter that blocks horizontally polarized light, which is the type of glare reflected from flat surfaces like water and roads.

Question 4

What does the term 'Abbe value' (V-number) measure in an ophthalmic lens material?

Accepted Answer

The material's resistance to chromatic dispersion

Answer

The Abbe value measures a material's resistance to chromatic dispersion; higher Abbe values indicate less color fringing and better optical clarity.

Question 5

When fitting a patient with rimless mountings, which lens material is most appropriate for long-term durability?

Accepted Answer

Polycarbonate or Trivex, due to impact resistance at drill points

Answer

Polycarbonate and Trivex resist cracking at drill holes better than other materials, making them the preferred choice for rimless and semi-rimless mountings.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ophthalmic Products and Materials 4