FREE ABO-NOCE Frame Adjustment Techniques by Material Questions and Answers

Question 1

What is the recommended method for heating an Optyl frame for adjustment?

Accepted Answer

A hot air frame warmer

Answer

Optyl is a thermosetting epoxy resin with a 'memory effect.' It requires uniform heating to around 80-120°C (176-248°F) to become pliable. A hot air warmer is the ideal tool, as a salt pan can cause overheating and damage the material's surface and properties.

Question 2

When adjusting a pure titanium or titanium alloy frame, what is a key characteristic the optician must account for?

Accepted Answer

It requires significant over-bending to retain the adjustment

Answer

Titanium is known for its strength, lightness, and flexibility, but it also has a high degree of 'springiness' or memory. This means the optician must often over-bend the frame past the desired point, allowing it to spring back into the correct alignment.

Question 3

Adjustments to frames made of nylon or polyamide, often used in sports eyewear, are best performed by:

Accepted Answer

Applying gentle pressure without heat (cold adjustment)

Answer

Nylon-based materials are very flexible and resistant to heat. Most adjustments, such as changing pantoscopic tilt or face form, can be done without heat. This is often referred to as 'cold-snapping' the adjustment into place.

Question 4

What is the primary precaution an optician should take when adjusting an older cellulose acetate (zyl) frame that may have become brittle?

Accepted Answer

Apply gentle, uniform heat to make it more pliable

Answer

Over time, the plasticizers in cellulose acetate can leach out, making the material dry and brittle. Applying gentle, uniform heat from a hot air warmer helps restore some pliability, reducing the risk of the frame cracking or snapping during adjustment.

Question 5

A frame made of memory metal, such as Flexon, has been bent out of shape. What is the standard procedure to return it to its original alignment?

Accepted Answer

Applying gentle heat to allow it to return to its shape

Answer

Memory metals are designed to return to their pre-set shape when heated. Gently applying heat from a hot air warmer will activate this property, causing the frame to automatically move back to its intended alignment without the need for manual bending.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

FREE ABO-NOCE Frame Adjustment Techniques by Material Questions and Answers