Eyeglass Measurements Flashcards Preview

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Flashcards in Eyeglass Measurements Deck (7)
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1
Q

is the longest horizontal opening in the eyewire. Inside edges of the frame eye

A

Frame A

2
Q

is the closest measurement between the two lenses. Inside edges of the

A

Frame DBL

3
Q

is the effective diameter of the eyewire opening which is used in determining lens cut-out in finishing work. 2x’s the longest possible radius within the eyewire opening

A

Frame ED

4
Q

is the longest vertical opening in the eyewire. Insides edges of the frame eye

A

Frame B

5
Q

Pupillary distance

A

PD

6
Q

Used for progressive lenses. Inside frame vertical to center of lense

A

Half B

7
Q

Distance from half B to top of segment

A

Seg Height or Seg Drop