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What is measured to obtain a monocular measurement of the IPD (interpupillary distance)?

A. Monocular pupillary distance
B. Binocular pupillary distance
C. Vertex distance
D. Refractive error

Answer :

Final answer:

A monocular measurement of the IPD involves measuring the Monocular pupillary distance. This involves the distance from the center of the pupil to the center of the bridge of the nose, and you can make this measurement yourself using a specific method involving a white sheet of paper and gradual distance.

Explanation:

To obtain a monocular measurement of the IPD (interpupillary distance), you need to measure the Monocular pupillary distance (option A) not Binocular pupillary distance, Vertex distance, or Refractive error. This is the distance from the center of the pupil (the black circle in the center of the eye) to the middle of the bridge of the nose. This measurement is typically done using a pupillometer (a device used to measure the IPD).

You can also attempt a manual measurement following a certain procedure. Draw two lines several mm apart on a white sheet of paper and move away from that sheet as it is held upright, measure the distance at which you can just distinguish the lines as separate. Use this information to calculate D, the diameter of your pupil.

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