NOCE Ophthalmic Products and Frames 3

Question 1

A rimless mounting uses which component to secure the lens to the bridge and endpiece?

Accepted Answer

A screw through a drilled hole in the lens

Answer

Rimless (drilled) mountings use a screw or post that passes through a hole drilled in the lens to attach it to the bridge and endpiece hardware.

Question 2

What is the recommended minimum lens thickness at the drill point for a rimless mounting to prevent cracking?

Accepted Answer

2.0 mm

Answer

A minimum of 2.0 mm of lens material at the drill site is generally recommended to provide sufficient structural integrity and prevent cracking.

Question 3

A frame is described as having a 'keyhole bridge.' What does this describe?

Accepted Answer

A bridge with a very narrow, elongated opening that contacts the nose on both sides

Answer

A keyhole bridge has a narrow elongated shape, making contact on the sides of the nose, and is typically used on vintage or classic frame styles.

Question 4

Which frame adjustment increases the distance between the lens back vertex and the cornea?

Accepted Answer

Moving the nose pads forward to push the frame away from the face

Answer

Moving nose pads forward on their arms pushes the frame away from the face, increasing vertex distance between the lens and the cornea.

Question 5

When fitting a high-plus power lens, which frame characteristic is MOST important to consider?

Accepted Answer

A small eye size to minimize lens thickness and weight

Answer

For high-plus lenses, a smaller eye size minimizes the center thickness and overall lens weight, improving comfort and cosmetics.

NOCE - National Opticianry Competency Examination Practice Test