DISP - Edging and Fitting Lenses - Week 10

Question 1

How are templates produced?

Answer 1

By tracing the frame eye shape and using a templete/former cutter

Question 2

Describe what is meant by marking up (4).

Answer 2

Positioning a frame properly by:

• finding the optical centre
• finding the horizontal axis
• decentring as required by prescription, frame size, and PD

Question 3

What is done if prism is required (2)?

Answer 3

Using the vertometer, decentre to the required prism

If larger amounts are needed, grind in more prism

Question 4

What is blocking and why is it important.

Answer 4

The process of preparing a lens so it remains in place through thr edging process.
This is important to keep the cyl axis and prism decentration correctly orientated.

Question 5

List three bevel types.

Answer 5

V-bevel
Mini V-bevel
Flat edge

Question 6

Define bevel position and where it usually is.

Answer 6

Where on the lens edge the bevel is placed, usually front or centre for best looking finish

Question 7

What three processes are part of finishing the edging process?

Answer 7

De-blocking
Chamfering
Fitting

Question 8

Describe the whole process for making glasses in 15 steps.

Answer 8

Measure patient's Rx
Measure D/N PD
Decide on lens form
Choose frame, measure frame size, eyesize, and bridge size
Determine position of lenses in the frame, including segment height
Determine minimum lens size
Dot the lens, optical centre and horizontal axis
Position for PD and centre height
Block lenses
Cut template
Edge lens to frame shape and chamfer
Fit lens
Check frame
Check according to Standards
Deliver glasses