ABO NOCE Basic Opticianry

Category - Ophthalmic Products

The alignment reference mark on a progressive can indicate?
  1. The add power of the lens
  2. The manufacturer of the lens
  3. Allow you to find the Distance Reference Point (DRP)
  4. All of the above
Explanation
Answer: D - The alignment reference mark on a progressive indicates all of the above.

Below the alignment reference mark on each less will be an engraving of the add power of the lens, the manufacturer and when both are dotted on the lens using a template, you will be able to find not only the DRP but NRP or near reference point as well. The DRP is where you will read the prescription’s distance power and the NRP is where you will read the near power.
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