Use the simulation of eyewear and the draggable millimeter ruler to measure the height of the segments in this pair of bifocals. Then compare the measured values to the prescribed values.
Finally, apply the appropriate standards to any differences between prescribed values and your measured values.
For the eyewear pictured here, decide whether the measured Segment Height meets optical standards in the right lens, the left lens and the total pair.
Apply the tolerances listed on this page to the differences between the measured values and the prescribed values. Decide whether or not each measured value meets standards.
From the choices shown below, select either "Meets standards" or "Does not meet standards" for the Right Lens, the Left Lens and the Total for the Pair.
Then submit your answers.