ABO NOCE Basic Opticianry Ophthalmic Products and Materials 5

Question 1

A patient needs a very high minus prescription (-12.00D). Which lens design feature would most effectively reduce edge thickness?

Accepted Answer

Full-field aspheric design with higher index material

Answer

Combining a high refractive index material with an aspheric design minimizes edge thickness in high minus prescriptions by reducing both center and edge bulk.

Question 2

Which coating is applied LAST during standard ophthalmic lens manufacturing?

Accepted Answer

Anti-reflective coating

Answer

Anti-reflective coatings are vacuum-deposited as the final step after all other treatments, since they are fragile and must not be exposed to subsequent processing.

Question 3

What material property makes memory metal (shape memory alloy) frames advantageous for patients with active lifestyles?

Accepted Answer

They return to original shape after bending or distortion

Answer

Memory metal alloys (typically nickel-titanium) can undergo significant bending and return to their original shape, making frames resistant to permanent distortion.

Question 4

A scratch-resistant hard coat on a plastic lens works by:

Accepted Answer

Providing a harder intermediate layer that resists abrasion

Answer

Hard coats provide a harder intermediate surface layer (typically silica-based) that resists abrasion better than bare plastic, though not as hard as mineral glass.

Question 5

Segment height in a lined bifocal refers to the measurement from:

Accepted Answer

The bottom of the lens to the top of the bifocal segment

Answer

Segment height is measured from the lowest point of the finished lens to the top of the bifocal segment, establishing where the reading area begins.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ophthalmic Products and Materials 5