Near PD is typically how much smaller than the distance PD?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Near PD is typically how much smaller than the distance PD?

Explanation:
When focusing on a near object, the eyes converge, causing the centers of the pupils to appear closer together. That inward turn makes the near pupillary distance smaller than the distance PD. In practice, this reduction is typically about 3 to 5 millimeters. So the near PD is usually 3–5 mm smaller than the distance PD. The other options don’t fit because the change is generally larger than 0 or 1–2 mm, and a reduction of 6–8 mm is unusually large for most people.

When focusing on a near object, the eyes converge, causing the centers of the pupils to appear closer together. That inward turn makes the near pupillary distance smaller than the distance PD. In practice, this reduction is typically about 3 to 5 millimeters. So the near PD is usually 3–5 mm smaller than the distance PD. The other options don’t fit because the change is generally larger than 0 or 1–2 mm, and a reduction of 6–8 mm is unusually large for most people.

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