NOCE Ophthalmic Products and Materials Questions and Answers

Question 1

A patient with a high-minus prescription who is sensitive to peripheral color fringing would benefit most from a lens material with which of the following characteristics?

Accepted Answer

A low refractive index and a high Abbe value

Answer

A low specific gravity and a low Abbe value

Answer

A high refractive index and a low Abbe value

Answer

A high specific gravity and a high Abbe value

Question 2

A construction worker requires prescription safety glasses. According to ANSI Z87.1 standards, which lens marking indicates the eyewear has been tested for high-impact resistance?

Accepted Answer

Z87+

Answer

Z87

Answer

Z87-2

Answer

D3

Question 3

An optician is designing a progressive addition lens for a patient with a high 'add' power who prefers a smaller, fashionable frame. To maximize the usable near vision area within the constraints of the small frame, which lens design characteristic should be prioritized?

Accepted Answer

A shorter corridor length

Answer

A longer corridor length

Answer

A harder lens design

Answer

A wider distance zone

Question 4

A patient with anisometropia of 2.50 D experiences vertical imbalance and diplopia when reading through their bifocal. To correct this, a slab-off is ordered. On which lens is a conventional slab-off typically ground?

Accepted Answer

The lens with the most minus or least plus power in the vertical meridian.

Answer

The lens with the most plus power in the vertical meridian.

Answer

The lens with the higher cylinder power.

Answer

The lens with the lower base curve.

Question 5

When comparing polycarbonate and Trivex lens materials for a drill-mounted frame, Trivex is often preferred due to its superior:

Accepted Answer

Tensile strength

Answer

Refractive index

Answer

Abbe value

Answer

Specific gravity

Question 6

An aspheric lens design is most beneficial for a patient with a high hyperopic prescription primarily because it:

Accepted Answer

Reduces lens thickness, weight, and peripheral distortions.

Answer

Increases the magnification effect for better reading.

Answer

Enhances chromatic aberration correction.

Answer

Allows for a greater range of tinting options.