FREE National Opticianry Competency Exam (NOCE) Ophthalmic Optics & Lens Design Questions and Answers

Question 1

A patient with a high hyperopic prescription (+6.00D sphere) frequently complains of peripheral distortions and a 'swim' effect when wearing their current standard spherical lenses.
Which lens design feature would most effectively mitigate these issues?

Accepted Answer

Aspheric design

Answer

Higher refractive index material

Answer

Photochromic treatment

Answer

Anti-reflective coating

Question 2

Which of the following lens properties is primarily responsible for reducing chromatic aberration in spectacle lenses?

Accepted Answer

Abbe value

Answer

Refractive index

Answer

Specific gravity

Answer

UV cut-off

Question 3

An optician is selecting a lens material for a patient who works in a demanding industrial environment and requires maximum impact resistance. Which lens material would be the most appropriate choice?

Accepted Answer

Polycarbonate

Answer

CR-39 plastic

Answer

High-index plastic (e.g., 1.67)

Answer

Crown glass

Question 4

When designing a progressive addition lens (PAL), what is the primary purpose of the 'corridor'?

Accepted Answer

To allow for intermediate vision correction

Answer

To provide a clear field of distance vision

Answer

To define the segment for near vision

Answer

To correct for unwanted astigmatism in the periphery

Question 5

A patient reports difficulty with night driving due to glare and halos around lights. Which lens coating would be most beneficial to recommend?

Accepted Answer

Anti-reflective (AR) coating

Answer

Scratch-resistant coating

Answer

UV protection coating

Answer

Mirror coating

Question 6

Which optical phenomenon describes the bending of light as it passes from one transparent medium to another of a different optical density?

Accepted Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Absorption

A patient with a high hyperopic prescription (+6.00D sphere) frequently complains of peripheral distortions and a 'swim' effect when wearing their current standard spherical lenses.Which lens design feature would most effectively mitigate these issues?

A patient with a high hyperopic prescription (+6.00D sphere) frequently complains of peripheral distortions and a 'swim' effect when wearing their current standard spherical lenses.
Which lens design feature would most effectively mitigate these issues?