For a B measurement of 54mm and an OC height requested of 32mm, where will the OC placement be?

For a B measurement of 54mm and an OC height requested of 32mm, where will the OC placement be?

• A. At the geometric center
• B. 5mm above geometric center
• C. 10mm below geometric center
• D. 3mm above geometric center

Answer: (B)

In determining the optimal placement of the optical center (OC) for a lens with given measurements, factors such as the B measurement and the requested OC height are critical. The B measurement, in this case, is 54mm, and the requested OC height is 32mm. The geometric center of the lens is typically at the midpoint of the B measurement, which would be 27mm from the bottom of the lens (54mm divided by 2). To find the appropriate OC placement, the requested height of 32mm needs to be considered in relation to the geometric center. Since the OC height is set above the geometric center, measuring 5mm above it indicates that the OC would be positioned at 32mm, aligning with the request. Thus, placing the OC 5mm above the geometric center establishes a suitable position that meets the specifications, making this option the correct choice.

In determining the optimal placement of the optical center (OC) for a lens with given measurements, factors such as the B measurement and the requested OC height are critical.

The B measurement, in this case, is 54mm, and the requested OC height is 32mm. The geometric center of the lens is typically at the midpoint of the B measurement, which would be 27mm from the bottom of the lens (54mm divided by 2).

To find the appropriate OC placement, the requested height of 32mm needs to be considered in relation to the geometric center. Since the OC height is set above the geometric center, measuring 5mm above it indicates that the OC would be positioned at 32mm, aligning with the request.

Thus, placing the OC 5mm above the geometric center establishes a suitable position that meets the specifications, making this option the correct choice.