FREE ABO NOCE Basic Opticianry Lens Materials & Design Questions and Answers

Question 1

Which lens material is known for its superior impact resistance, making it the material of choice for children's eyewear and safety glasses, despite having a lower Abbe value than CR-39?

Accepted Answer

Polycarbonate

Answer

High-index plastic (1.67)

Answer

CR-39 plastic

Answer

Crown glass

Question 2

A patient with a high myopic prescription of -8.00D requests thinner, lighter lenses. Which lens material and design feature would be most appropriate to recommend?

Accepted Answer

High-index plastic (e.g., 1.67 or 1.74) with aspheric design

Answer

CR-39 plastic with aspheric design

Answer

Polycarbonate with spherical design

Answer

Crown glass with spherical design

Question 3

Which of the following is a primary benefit of using an aspheric lens design?

Accepted Answer

Reduced peripheral distortion and a flatter, thinner lens profile

Answer

Increased chromatic aberration

Answer

Higher Abbe value for better optical clarity

Answer

Improved resistance to scratching

Question 4

A patient frequently works outdoors and requires lenses that automatically darken in UV light. Which lens technology would be most suitable for this patient?

Accepted Answer

Photochromic lenses

Answer

Polarized lenses

Answer

Anti-reflective coated lenses

Answer

Blue light filtering lenses

Question 5

What is the primary disadvantage of using Crown glass as a lens material compared to CR-39 plastic?

Accepted Answer

Heavier weight and lower impact resistance

Answer

Higher Abbe value, leading to more chromatic aberration

Answer

Significantly lighter weight, making frames less comfortable

Answer

Lower scratch resistance, requiring frequent replacement

Question 6

When considering lens materials, what does a higher 'index of refraction' generally indicate?

Accepted Answer

The lens material bends light more efficiently, allowing for thinner lenses.

Answer

The lens material is less dense and therefore lighter.

Answer

The lens material scatters more light, leading to increased glare.

Answer

The lens material has a higher resistance to impact.