If the distance PD is 64 mm and the near PD is 60 mm, what is the seg inset?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

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

If the distance PD is 64 mm and the near PD is 60 mm, what is the seg inset?

Explanation:
Seg inset is how far the near segment must be moved toward the nose so the near vision line aligns with the pupil. Since near PD is typically smaller than distance PD, you inset by the difference between them. Here, distance PD is 64 mm and near PD is 60 mm, so the difference is 4 mm. Therefore, the seg inset is 4 mm. If both PDs were equal, no inset would be needed; if near PD were larger, you’d adjust in the opposite direction.

Seg inset is how far the near segment must be moved toward the nose so the near vision line aligns with the pupil. Since near PD is typically smaller than distance PD, you inset by the difference between them. Here, distance PD is 64 mm and near PD is 60 mm, so the difference is 4 mm. Therefore, the seg inset is 4 mm. If both PDs were equal, no inset would be needed; if near PD were larger, you’d adjust in the opposite direction.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy