ABO NOCE Basic Opticianry

Category - Instrumentation

Vertex distance is measured by using which tool?
  1. Pupilometer
  2. PD ruler
  3. Distometer
Explanation
Answer: C - Vertex distance is measured by using a distometer.

The distometer is made to easily slide between the patient's eye and the frame to measure the vertex distance.

The pupilometer measures the distance between the pupils, and the PD ruler is also used to measure a patient's pupils as well as measurements of frames and lenses.
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