Frame Measurements

Question 1

The Boxing system’s measurement A

Answer 1

Lens or eye size. Measure across the top of lens horizontally.

Question 2

The boxing system’s Measurement B

Answer 2

Lens height. Measure lateral edge of lens vertically.

Question 3

The Boxing system’s measurement C

Answer 3

Horizontal measurement at the Datum line. Appears to be at the middle, not always located exactly at the middle of the lens.

Question 4

Frame difference

Answer 4

The difference between the horizontal and vertical measurements in mm. Larger the difference the rectangular the box appears.

Question 5

Geometric center distance (GCD)

Answer 5

Can be calculated by adding eye size to DBL, or distance between lenses.

Other names;
Frame PD
Frame center distance

Question 6

Temple length

Answer 6

Distance from where the arm connects at the front, to where the arm begins to bend. Measure top of the bend to bottom. Add 2 numbers together.

Question 7

Distance between Lenses

Answer 7

Same a bridge size. Measure length of the bridge

Question 8

Effective distance Measurement

boxing system

Answer 8

ED measurement

diagonal measurement across lens