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What is the relationship between the bifocal add and the lens when using a lensometer?

Front side
Back side
Bottom side
Top side

The correct answer is: Front side

When using a lensometer, the front side of the lens is typically used to determine the bifocal add. This is because the front side of the lens contains the power of the lens and the bifocal add is a separate power added on top of that. The back, bottom, and top sides do not typically contain the power of the lens and would not be useful in determining the bifocal add. Therefore, the front side is the correct answer for this question.