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OPT 1400L (FULL OVERVIEW) > Surfacing Process > Flashcards

Surfacing Process Flashcards

1
Q

Define surfacing

A

The process of creating the prescribed refractive power, prism , and major reference point (AKA PRP) location on a lens by generating the required curves and bringing the surface to a polished state.

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2
Q

What is the purpose of the surfacing process?

A
  • generates (cuts or grinds) the curves that gives the lens power, prism, and it’s PRP location.
  • smooth and polishes the power curves to a transparent-like clarity.
  • creates the general size (diameter) and thickness of a lens.
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3
Q

What are the two major methods of surfacing ?

A

Conventional and digital

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4
Q

What happens during the conventional method of surfacing ?

A
  • front surface is fully molded with base curve, channel, addition, and etchings completed.
  • the distance prescription is ground into the back surface of the lens blanks.
  • lenses need to be fined and polished with identically shaped lap toll surface for each lens.
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5
Q

What happens during the digital method of surfacing?

A
  • a diamond point lathe cutter, cuts the prescription into the back and/or front surfaces of a semi-finished lens blank.
  • no fining stage is necessary.
  • uses a soft lap polishing tool to smooth out the lens surface.
  • a laser can be used to etch progressive markings onto the lenses.
  • can integrate other measurements such as near PD, pantoscopic tilt, face form wrap, and vertex distance.
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6
Q

Wavefront technology

A

Designed to correct higher-order aberrations, provide sharper vision than regular lenses, help wearers see better in low light conditions, and experience improved contrast and color vision.

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7
Q

Freeform

A

Effectively “optimized” because they can be precisely generated to a power of 0.01D.

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8
Q

What happens during the surfacing lab?

A
  • processes a semi-finished lens blank by completing the generation stages
  • also can complete the finishing process

Also called : full service lab, fabrication lab, production lab

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9
Q

What happens during the finishing lab?

A
  • processes finished lens blanks and uncut lenses by completing the edging
  • assembles spectacles
  • cleans and performs final quality inspection
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10
Q

What happens during the lens choice stage ?

A

The semi-finished lens is chosen.

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11
Q

What happens during the calculation stage ?

A

Information is inserted into the computer.

  • patient info
  • frame info
  • lens info
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12
Q

Patient info in the lab calculation stage include:

A

Rx
PD
Fitting Height

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13
Q

Frame info in the lab calculation stage include:

A

Design and size

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14
Q

Lens info in the lab calculation stage include:

A 
Design
Material 
BC
Size
Blank thickness
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15
Q

Computer info dataflow chart

A
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16
Q

Computer information dataflow chart

A
17
Q

What happens during the layout and blocking stage ?

A

Layout: movement or orientation of a lens in preparation for a cutting procedure.

Blocking: process of adhering the surface block to the lens blank.

18
Q

What happens during the generation stage ? ( 3 main functions)

A
  • it cuts and grind the power curves (F2) into the back surface of the lens blank.
  • reduces the thickness of the lens by removing the majority of the material.
  • reduces the overall diameter of the lens through cribbing.
19
Q

What happens during the fining stage ?

A

Smooth the back surface after generation stage. WET SANDING.

The cylinder machine is used to do this.

A lap tool with an attached fining pad.

20
Q

What’s the cylinder machines task ?

A

To smooth the back surface

21
Q

What is a lap tool?

A

A block of metal, plastic, or styrofoam that exhibits convex curves on the top.

22
Q

What is a fining pad ?

A

Flower shaped portion of sandpaper that is mounted on the lap tool

23
Q

What happens during the polishing stage ?

A

Brings the lens back to a clear stage and restores clarity.

Use of a smoother fuzzy polish pad and lens polish.

24
Q

What happens during de-blocking and cleaning stage?

A

Surface block and surface saver tape and removed from the front of the lens.

Cleaned with isopropyl alcohol to remove block bonding material.

25
Q

What happens during the scratch coat application stage ?

A

Lens is inserted into a machine that applies SRC to F2 of the lens.

AR can be applied to cloth sides with a different machine.

26
Q

Typical surfacing stage flowchart

A
27
Q

1st inspection

A

Mid point between surfacing and finishing processes.

28
Q

What is verified in the 1st inspection stage ?

A 
Rx
Proper design and material 
Proper coating and treatments 
Center thickness
Free of imperfections and defects

OPT 1400L (FULL OVERVIEW) (8 decks)

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