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OPT 1400L (FULL OVERVIEW) > Lab Equipment > Flashcards

Lab Equipment Flashcards

1
Q

What are the two major development processes in a complete fabrication laboratory?

A

Surfacing process and finishing process

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2
Q

What happens during the surfacing process?

A
  • generate the curves that gives the lens power

- creates the general size and thickness of a lens

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3
Q

What happens during the finishing process?

A
  • verifies powers and calculate for proper placement in the chosen frame.
  • trims or edges the lenses for fitting into the frame.
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4
Q

What are some of the stages in the surfacing process?

A
  • choose lenses
  • complete calculations
  • layout and block lenses for surfacing -generate lenses
  • fine lenses
  • polish lenses
  • de-blocking and cleaning of lenses -inspection of lenses for accuracy
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5
Q

What is a semi finished lens?

A

A lens that has the base curve (F1) completed but will require the power curve (F2) to be cut into the rear of the blank.

They are also called surface blanks and are thicker and normally packaged in boxes.

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6
Q

What is a finished lens?

A

A lens that has both the front (F1) and back (F2) surfaces complete. Finish blanks skip the surfacing process and go directly to the finishing process.

They are usually thinner and are packaged in envelopes.

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7
Q

Which process is the calculation stage apart of?

A

Surfacing process

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8
Q

What is the calculation stage?

A

Information that is put into the computer.

This information will include:

  • patient info
  • frame info
  • lens info 
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9
Q

What type of patient information would be included in the calculation stage?

A
  • RX
  • PD
  • Heights
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10
Q

What type of frame information would be included in the calculation stage?

A
  • Design

- Size

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11
Q

What type of lens information would be included in the calculation stage?

A
  • Design
  • Material
  • BC (F1)
  • Size (diameter)
  • Blank thickness (ET /CT)
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12
Q

Computer information data flow chart

A
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13
Q

What process is the layout and blocking stage apart of?

A

The surfacing process

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14
Q

What does layout mean?

A

Movement or orientation of a lens in preparation for a cutting procedure.

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15
Q

What does blocking mean?

A

The actual process of adhering the surface block to the lens blank.

This can be done with the aid of a bonding material such as wax or metal alloy. 

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16
Q

Which process is the generation stage apart of?

A

The surfacing process

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17
Q

What are the three main functions to perform in a surfacing lab during the generation stage?

A
  • it cuts or grind the power curves (F2) into a 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. 
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18
Q

Which process is the fining stage a part of?

A

The surfacing process

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19
Q

What is the task of the cylinder machine?

A

To smooth the back surface of the lens.

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20
Q

What can fining stage be compared to?

A

A form of wet sanding.

I left too within a attach finding pad is insert into them she in along with the lens and its adjoined block.

As the pads rotate against the backside of the lens, water is injected in between the pad and the lens. 

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21
Q

What is a lap tool?

A

Block of metal, plastic, or Styrofoam that exhibits convex curves on the top.

These curves are designed to match the concave power curves on the rear of the lens. 

22
Q

What is a fining pad?

A

A flower shaped portion of sandpaper.

It contains a sticky adhesive on the backside which allows it to be mounted onto a lap tool during the fining stage.

23
Q

Which process is the Polishing stage apart of?

A

The surfacing process

24
Q

What is the polishing stage?

A

The use of the cylinder machine and polishing pads that are a smoother and fuzzier to bring back the lens clarity.

25
Q

Which process is the De-blocking and cleaning stages a part of?

A

The surfacing process

26
Q

What happens during the de- blocking and cleaning stage?

A

The surface block and the surface saver tape is removed from the front of the lens.
It is then cleaned with isopropyl alcohol removing all remaining block bonding material.

27
Q

Which process is the scratch coat application stage apart of?

A

The surfacing process

28
Q

What happens during the scratch coat application stage?

A

The freshly clean lens is inserted into a machine which applies the scratch resistant coating to the backside (F2) of the lens.

An additional coding may be applied using a different machine which reduces reflections and increases light transmission through the lens.

This antireflective coating is usually adhere to both sides of the lens.

29
Q

First inspection stage

A

All of the previous work is inspected.

If the lens passes, it qualifies to continue to the rest of the finishing process.

If the lens fails, it is discarded and the surfacing process for the job order begins again. 

30
Q

A typical surfacing stage flow chart

A
31
Q

What are some of the stages in the finishing process?

A
  • complete first inspection
  • Mark lenses for finishing layout
  • layout and block lenses for edging
  • edge lenses for frame
  • spectacle assembly
  • Final spectacle inspection for accuracy and quality



32
Q

What are some other stages that may be included in the finishing process that aren’t always necessary? 

A

The application of coatings:

  • antireflective
  • scratch resistance
  • tints
  • ultraviolet filters
33
Q

What is the first inspection?

A

The midpoint between the surfacing and the finishing processes. 

34
Q

What happens during the first inspection?

A 
Verification of:
prescription
proper design and material
proper coatings and treatments
center thickness

Ensuring it is free of imperfection and defects.

35
Q

Which process is the marking of lenses stage apart of?

A

The finishing process

36
Q

What happens during the marking a lenses of stage?

A

The lensometer has ability to place three dots on the lenses part of the power, axis, and prism verification stage.

37
Q

What happens during the frame pattern stage?

A

Frame patterns are used to inform the edger machine of what shape and size to edge the finished lens in order for it to fit properly into the frame.

38
Q

What does a frame tracer do?

A

Obtain the size and shape of the frames eyewire in order to instruct the edger as to how the lens is to be edged for the frame.

39
Q

Which process is the layout and blocking of lenses stage apart of?

A

The finishing process 

40
Q

What happens during the layout and blocking of lenses stage?

A

“Layout” consist of decentering and orientating the lens for the finishing process.

“Blocking “attaches the finishing Block to the front of the lens with a double-sided sticky rubber pad.
This pad is referred to as a finishing pad, edger block pad, or leap pad.

The block allows the edger to position and clamp the lens to ensure it will remain on access during the edging stage.

41
Q

Which process is the edging stage apart of?

A

The finishing stage

42
Q

What happens during the edging stage?

A

It trims the edge of the lens to the specific shape and size required to fit the selected frame.

43
Q

What are some other procedures that may be included in the edging stage?

A

-Placement of the finishing edge bevel such as:
V-full eyewire
Groove-nylon suspension
Flat-drill mount

  • Placement of the safety(pin) bevel.
  • Installation of an edge polish.
  • Drilling of holes for rimless frames. 
44
Q

Which process is the spectacle assembly stage a part of?

A

The finishing process

45
Q

What happens during the spectacle assembly stage?

A

Clean the lens of any swarf (excess plastic from edging).

Glazing: The process of inserting the lens into a holder (frame).



46
Q

What is swarf?

A

Excess plastic slag that is clean from the lens and discarded.

47
Q

What does glazing mean?

A

The process of inserting the lens into a holder (frame). 

48
Q

Which process is the final inspection stage apart of?

A

The finishing process

49
Q

What happens during the final inspection stage?

A

Each pair of spectacles is required to pass a series of quality assurance checks.
The checks follow a set of recommendations presented by ANSI.

50
Q

During final inspection, what are some of the quality assurance points that may be checked?

A
  • correct prescription
  • correct placement
  • correct lenses
  • correct lens thickness
  • correct frame
  • free from defects or imperfections
  • assembled correctly
  • cleaned and free from marks and debris
51
Q

Typical finishing stage flow chart

A

OPT 1400L (FULL OVERVIEW) (8 decks)

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