Lens Manufacture

0.0(0)
Studied by 0 people
call kaiCall Kai
Locked
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/6

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 1:12 PM on 7/13/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai
Chat

No analytics yet

Send a link to your students to track their progress

7 Terms

1
New cards

Describe the thickness of positive and negative lenses

-ve lenses: thicker on edge- thickness is determined by power

+ve lenses: thicker in centre

2
New cards

How can lenses be made?

Either by/ combo of:

  1. Moulding: moulded from liquid (monomer + catalyst)

OR

  1. Grinding:

    a- Generating/ rough cut via generating wheel

    Rc = y/ sin0

    (Surface radius= semi diameter / angle of presentation)

    b- Smoothing: abrasive pad for smooth surface

    c- Polishing: finer abrasive pad

3
New cards

What does ‘blocking’ mean?

Attaching a block to the lens so it can be held for edging/ surfacing

4
New cards

What does ‘slumping’ mean?

Heating glass until it ‘slumps’ into the mould (PPLs/ multifocals)

5
New cards

What does glazing mean?

Cutting the lens to the correct shape and size, then edge profiling so it can fit into the frame

6
New cards

How do you work out MSU?

MSU= Longest frame length + (2x decen) + 2mm

7
New cards

How do you work out decentration?

((Longest frame length + DBL) - PD)/ 2 = the decentration per lens