NAO VOLUME IV QUESTIONS AND ANSWERS | LATEST UPDATE | 2024/2025 | 100% PASS
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NAO VOLUME IV
Institution
NAO VOLUME IV
NAO VOLUME IV QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | 100% PASS
How does a bifocal lens differ from a single-vision lens?
A bifocal lens has two distinct optical powers to correct near and distance vision, while a
single-vision lens has only one prescription.
What does "base c...
NAO VOLUME IV QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | 100% PASS
How does a bifocal lens differ from a single-vision lens?
✔✔A bifocal lens has two distinct optical powers to correct near and distance vision, while a
single-vision lens has only one prescription.
What does "base curve" refer to in the context of lens design?
✔✔The base curve is the curvature on the front surface of the lens, affecting both fit and optical
performance.
What are photochromic lenses?
✔✔Photochromic lenses adjust to light levels, darkening in bright sunlight and becoming clear
indoors, offering convenience and UV protection.
How does prism correction work in lenses?
✔✔Prism correction shifts light entering the eye, helping individuals with eye alignment issues
to see a single, unified image.
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, Why is accurate pupillary distance (PD) measurement important?
✔✔Accurate PD ensures that the lenses align properly with the eyes' centers, which is essential
for optimal visual clarity and comfort.
What are occupational lenses, and when are they used?
✔✔Occupational lenses are specialized for certain tasks, like computer work or hobbies,
providing optimal vision for specific distances.
What is a slab-off prism, and why might it be necessary?
✔✔A slab-off prism corrects vertical imbalance in the lenses, helping individuals with
significant prescription differences between eyes.
What does “prescription balance” mean in eyeglass lenses?
✔✔Prescription balance refers to ensuring that lenses provide coordinated vision between both
eyes, crucial for those with differing prescriptions.
How does an anti-scratch coating benefit lenses?
✔✔An anti-scratch coating protects lenses from minor abrasions, extending the lens’s life and
maintaining optical clarity.
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