If there is BD over one eye, how should you adjust the seg height?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

If there is BD over one eye, how should you adjust the seg height?

Explanation:
When vertical prism is present in one eye, it shifts the perceived image vertically in that eye. To keep the near portion of the lens (the segment) aligned with the pupil for reading, you raise the segment height. This moves the reading area upward on the lens so the pupil lines up with the segment during downgaze. Lowering the segment would worsen misalignment, doing nothing wouldn’t correct it, and moving the frame horizontally doesn’t address the vertical shift.

When vertical prism is present in one eye, it shifts the perceived image vertically in that eye. To keep the near portion of the lens (the segment) aligned with the pupil for reading, you raise the segment height. This moves the reading area upward on the lens so the pupil lines up with the segment during downgaze. Lowering the segment would worsen misalignment, doing nothing wouldn’t correct it, and moving the frame horizontally doesn’t address the vertical shift.

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