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Ophthalmic and Mechanical Optics > Surfacing and Benchwork > Flashcards

Surfacing and Benchwork Flashcards

1
Q

it is how a lens is created

creates the necessary power or prescription

A

Surfacing

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2
Q

a stage when removing material from the surface of the lens

A

Grinding (surfacing or generating)

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3
Q

brings surface of the lens to almost clear

A

Fining

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4
Q

Brings surface of lens to perfect smooth clear finish

A

Polishing

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5
Q

entails the second phase towards completion of an ophthalmic prescription order

A

Benchwork

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6
Q
  • it is the operation done, after the lens has been finished from the grinding laboratory
  • insertion or mounting the lens to a spectacle frame
  • mounting with utmost precision to satisfy the requirements of a given prescription
A

Benchwork

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7
Q

Stages of benchwork in Full Rim frames:

A
  • Centering
  • Layout
  • Cutting
  • Chipping or crumbing
  • Edging
  • Glazing
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8
Q

Stages of benchwork in Semi-rimless/Rimless frame:

A
  • Centering
  • Layout
  • Cutting
  • Chipping or Crumbing
  • Edging
  • Grooving or Drilling
  • Mounting
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9
Q

the process of determining and marking the:

  • optical center
  • axis of a cylinder
  • base-apex line of a prism
A

Centering

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10
Q
  • this process consists of marking the proper decentration and insetting
  • placing the cylinder axis and base apex line in its proper position
A

Layout (bench)

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11
Q

process of tracing the outline of a desired shape former on a lens surface with a cutting implement

A

Cutting

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12
Q

process of removing large or big particles or surplus glass from the lens with the use of pliers

A

Chipping

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13
Q

process of removing small particles of the lens

A

Crumbing

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14
Q

process of removing the excess and irregular glass smoothly from the lens by means of a grindstone

A

Edge grinding or Edging

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15
Q

edging for rimless frame:

A

Flat edging

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16
Q

edging for plastic and metal full rim frame:

A

Bevel Edging

17
Q

process of boring holes through the surface of the lens indicated for rimless frame

A

Drilling

18
Q

process of creating a canal in the edge of the lens for semi-rimless frames

A

Grooving

19
Q

process of inserting a shaped lens of glass into a channeled or grooved eyewire or rim

A

Glazing

20
Q

process of placing or fitting a shaped lens or glass in a rimless spectacle or eyeglass

A

Mounting

21
Q

a point on the lens where the line of sight passes

also known as the Visual Point

A

Wearing Point

22
Q
  • the flat or angled surface
  • usually the fine ground
  • limits the refracting surface of a lens
A

Edge

23
Q

the frontal outline of the lens

A

Shape

24
Q

is the difference between the horizontal and vertical diameter of the lens

A

Pattern of the Lens

25
Q

is the displacement of optical center (O.C) from the wearing point or mechanical center

A

Decentration

26
Q

purposes of decentration:

A
  • to produce desirable prismatic effect
  • to avoid or eliminate undesirable prismatic effect
27
Q

a device used as a guide for cutting the lens in order to obtain the desired shape

A

Former

28
Q

Kinds of Former:

A
  • Hand former
  • Mechanical Former
  • Symmetrical formers
  • Asymmetrical formers
29
Q
  • formers usually made of cardboard
  • transparent celluloid or thin sheet metals
  • suitable for cutting odd shaped lenses
A

Hand Former

30
Q

former used for automatic cutting machines

A

Mechanical former

31
Q

a former having a similar and uniform shape on both temporal and nasal sides

A

Symmetrical Former

32
Q

former in which the temporal and nasal sides are dissimilar

A

Asymmetrical Former

Ophthalmic and Mechanical Optics (10 decks)

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