Question

Your client’s PD is 62. The frame eyesize is 48, and the DBL is 18. When you block this lens, how much will the decentration per lens be?

Answer 1

2 mm

Explanation:

Remember that the formula is: (DBC-PD) ÷ 2

and

DBC = DBL + frame eye size.

The correct answer is: 2 mm