When converting a bifocal prescription to a reading-only prescription, which number changes?

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 Shopko Optician Certification Test. Study with flashcards and multiple choice questions. Enhance your knowledge with detailed explanations and get ready to excel in your exam!

Multiple Choice

When converting a bifocal prescription to a reading-only prescription, which number changes?

Explanation:
Converting a bifocal to a reading-only lens means moving from two focal powers to a single near focus. The bifocal includes an Add for near work, while a reading-only lens uses no Add. To keep the same near vision in a single-vision reading lens, the near power is incorporated into the main spherical correction. That means the sphere value is adjusted (the Add is dropped) to reflect the combined near power. The cylinder and axis, which handle astigmatism, generally remain as they were for distance correction in this standard conversion. So the sphere is the number that changes.

Converting a bifocal to a reading-only lens means moving from two focal powers to a single near focus. The bifocal includes an Add for near work, while a reading-only lens uses no Add. To keep the same near vision in a single-vision reading lens, the near power is incorporated into the main spherical correction. That means the sphere value is adjusted (the Add is dropped) to reflect the combined near power. The cylinder and axis, which handle astigmatism, generally remain as they were for distance correction in this standard conversion. So the sphere is the number that changes.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy