Eyeglass Measurements

Question 1

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

Answer 1

Frame A

Question 2

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

Answer 2

Frame DBL

Question 3

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

Answer 3

Frame ED

Question 4

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

Answer 4

Frame B

Question 5

Pupillary distance

Answer 5

PD

Question 6

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

Answer 6

Half B

Question 7

Distance from half B to top of segment

Answer 7

Seg Height or Seg Drop