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Ophthalmic and Mechanical Optics > Boxing system Measurements > Flashcards

Boxing system Measurements Flashcards

1
Q

they adopted the boxing system to provide a standard for frame and lens measurement

A

Optical Manufacturers Association - 1962

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2
Q

based upon the idea of drawing an imaginary box around a frame/lens

A

Boxing system

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3
Q
  • The horizontal distance between the furthest temporal and nasal edges of the lens shape
  • distance between the vertical sides of the box
  • also known as the eyesize
A

“A” measurement

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4
Q
  • the vertical distance between the furthest top and bottom edges of the lens shape
  • distance between the horizontal sides of the box
A

“B” measurement

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5
Q

the horizontal line that runs through the vertical center of the frame

A

Datum Line

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6
Q

the intersection of the Datum line and horizontal centers of each lens shape

A

Geometric Center (GC)

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7
Q
  • the shortest distance between the nasal edges of each lens
  • the distance between boxes
  • commonly referred to as bridge size
A

Distance Between Lenses (DBL)

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8
Q
  • the horizontal distance between the geometric centers of the lens
  • also known as the Geometric Center Distance (GCD)
  • more commonly referred to as the frame PD
A

Distance Between Centers (DBC)

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9
Q
  • twice the distance from the geometric center of the lens furthest edge of the lens shape
  • used in combination with decentration distance to select the minimum lens blank size required to fit a give frame
A

Effective Diameter (ED)

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10
Q

the smallest diameter lens that would cutout, if the frame’s geometric center matched the lens optical center

A

Effective Diameter (ED)

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11
Q

The vertical distance between the bottom edge of the box and top of the bifocal or trifocal segment

A

Segment Height

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12
Q

the vertical distance between the Datum line and the top of the bifocal or trifocal segment Overall

A

Segment Drop

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13
Q

the running distance between the middle of the center barrel screw hole and the end of the temple

A

Temple Length (OTL)

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14
Q

the distance between the center of the barrel and the middle of the temple bend

A

Length To Bend (LTB)

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15
Q

the distance between the plane of the front of the frame and the temple bend

used if there is significant distance between the frame front and the beginning of the temple

A

Front To Bend (FTB)

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16
Q

a point in the lens around which the lens is cut and edged

A

Mechanical Center

17
Q

it is a horizontal line passing through the mechanical center

A

Mechanical line or Cutting line

Ophthalmic and Mechanical Optics (10 decks)

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