NOCE Ophthalmic Products and Frames 4

Question 1

Which type of anti-reflective (AR) coating layer is responsible for repelling water, oils, and smudges?

Accepted Answer

The hydrophobic top coat

Answer

The hydrophobic top coat, also called an oleophobic layer, forms the outermost surface and repels water and oils to make lenses easier to clean.

Question 2

A patient reports that their acetate frame has become too tight after adjustment. What is the safest method to re-soften and reshape the frame front?

Accepted Answer

Use a frame warmer or salt pan at 140-160°F (60-71°C)

Answer

A frame warmer or salt pan at 140–160°F is the controlled, safe method to soften acetate for adjustment without scorching or warping.

Question 3

What does the term 'zygomatic arch adjustment' refer to in frame fitting?

Accepted Answer

Adjusting pantoscopic tilt to accommodate high cheekbones

Answer

A zygomatic (cheekbone) adjustment involves modifying the pantoscopic tilt or frame fit to account for a patient's prominent cheekbones that affect how the frame sits.

Question 4

Which lens material is MOST impact-resistant and is required by ANSI Z87.1 for occupational safety eyewear?

Accepted Answer

Polycarbonate

Answer

Polycarbonate is the most impact-resistant common ophthalmic material and meets ANSI Z87.1 requirements for occupational safety eyewear.

Question 5

A frame's eye size is 54, DBL is 16, and the patient's PD is 64 mm. What is the decentration per lens needed for proper optical alignment?

Accepted Answer

3 mm temporal decentration per lens

Answer

Frame PD = (54/2) + 16 + (54/2) = 70 mm; patient PD = 64 mm; difference = 6 mm total, so 3 mm temporal decentration per lens is required.

NOCE - National Opticianry Competency Examination Practice Test

NOCE - National Opticianry Competency Examination Practice Test

NOCE Ophthalmic Products and Frames 4