Practice Quiz

ABO NOCE Basic Opticianry

Category - Instrumentation

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How can you check a lens clock to make sure it is still calibrated correctly?
  1. Send it to the lab and have them check it
  2. Place all three points of the clock on a flat surface, depress until all points touch. The dial should read zero.
  3. Test against the base curve of a lens you already know to be accurate to see if it is the same
Explanation
Answer: B - Checking a lens clock to make sure it is still calibrated is done by placing all three points of the clock on a flat surface and depressing the clock until all points touch. The reading should be zero.

If the reading is not zero, send it to your lab and they can recalibrate it.
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