ABO NOCE Basic Opticianry Lens Coatings and Treatments

Question 1

What is the primary purpose of an anti-reflective (AR) coating on ophthalmic lenses?

Accepted Answer

To eliminate surface reflections, improve light transmission, and reduce glare

Answer

To protect lenses from scratches and surface abrasions

Answer

To block ultraviolet radiation from reaching the eye

Answer

To darken the lens automatically in bright sunlight

Question 2

Which type of lens treatment darkens when exposed to ultraviolet (UV) radiation and returns to clear when indoors?

Accepted Answer

Photochromic

Answer

Polarized

Answer

Mirror-coated

Answer

Anti-reflective

Question 3

What is the approximate percentage of light lost due to reflection on each uncoated CR-39 lens surface?

Accepted Answer

4%

Answer

1%

Answer

8%

Answer

12%

Question 4

Which lens coating is applied primarily to repel water, smudges, and fingerprints from the lens surface?

Accepted Answer

Hydrophobic/oleophobic coating

Answer

Anti-reflective coating

Answer

Hard coat

Answer

UV absorbing coating

Question 5

What is the function of a scratch-resistant hard coat applied to plastic ophthalmic lenses?

Accepted Answer

Provides a more durable surface to resist surface abrasions

Answer

Blocks UV radiation from reaching the eye

Answer

Increases the refractive index of the lens material

Answer

Changes tint density based on ambient light conditions

Question 6

According to ANSI Z80.3, UV-absorbing ophthalmic lenses should block radiation up to which wavelength to provide complete UV protection?

Accepted Answer

400 nm

Answer

280 nm

Answer

315 nm

Answer

380 nm

Question 7

Which statement best describes how a polarized lens reduces glare?

Accepted Answer

It filters out light waves vibrating in the horizontal plane to reduce reflected glare

Answer

It darkens automatically when exposed to bright light

Answer

It applies multiple thin layers to eliminate surface reflections

Answer

It has a gradient tint that is darker at the top than the bottom