American Board of Opticianry (ABO) Practice Test

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What type of PD best compensates for facial asymmetry?

  1. -6.50

  2. -7.50

  3. -1.00

  4. -2.00

The correct answer is: -7.50

Some may assume that the answer is -6.50 or -7.50 because they are negative numbers and may be associated with facial asymmetry. However, the correct answer of -7.50 has a larger magnitude, making it a better option for compensating for facial asymmetry. Choices C and D may seem like valid numbers, but they are too small to make a significant difference in correcting facial asymmetry. Choice A is irrelevant and not related to PD or facial asymmetry.

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