If the desired frame is smaller than the frame you have on display, what should you do to adjust the seg height on the new frame?

• A. Compare the A's to each other or B's to each other and divide the difference by 2. Then subtract this amount from the seg height
• B. Increase seg height by half the difference
• C. Add the full difference to seg height
• D. Leave seg height unchanged

Answer: (A)

When you switch to a frame that’s smaller, you want the reading portion to sit in the same position relative to the eye. To do this, adjust the seg height by half of the difference between the two frames in the corresponding dimension (eye size or bridge). Subtract that half-difference from the seg height. This moves the segment just enough to maintain the same line of sight through the reading area in the new, smaller frame.

If you increased the seg height or left it alone, the reading portion would misalign with the wearer's gaze in the new frame. Adding the full difference would overshoot the adjustment.