NAO TEST 4 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | 100% PASS
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NAO
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NAO
NAO TEST 4 QUESTIONS AND
ANSWERS | LATEST VERSION |
2024/2025 | 100% PASS
What does "prism" in lenses achieve in vision correction?
Prism in lenses redirects light to assist with alignment issues in the eyes, helping with double
vision.
How does the base direction of a prism impact vision...
NAO TEST 4 QUESTIONS AND
ANSWERS | LATEST VERSION |
2024/2025 | 100% PASS
What does "prism" in lenses achieve in vision correction?
✔✔Prism in lenses redirects light to assist with alignment issues in the eyes, helping with double
vision.
How does the base direction of a prism impact vision?
✔✔The base direction of a prism determines where the image shifts, guiding the eyes to work
together more effectively.
What is "decentration" in lens fitting?
✔✔Decentration is the process of adjusting a lens so that its optical center aligns with the pupil,
optimizing vision clarity.
Define the term "inter-pupillary distance."
✔✔Inter-pupillary distance (PD) is the distance between the centers of the pupils, crucial for
positioning lenses correctly.
1
,Why is "lens thickness" important in prescription glasses?
✔✔Lens thickness affects both weight and appearance; thicker lenses are more noticeable and
can make glasses heavier.
What is the purpose of "anti-reflective coating" on lenses?
✔✔Anti-reflective coating reduces glare and reflections, improving clarity and comfort,
especially in low-light conditions.
Explain the concept of "near-sighted" versus "far-sighted" lens prescriptions.
✔✔Near-sighted lenses are concave, correcting close-up focus issues, while far-sighted lenses
are convex to help with distance vision.
What is "base curve" in the context of lens design?
✔✔The base curve is the curvature of the front surface of a lens, influencing vision clarity and
compatibility with frames.
How is "lens power" measured and recorded in prescriptions?
✔✔Lens power is measured in diopters, indicating the corrective strength needed to focus light
properly on the retina.
2
, What is the role of a "fitting cross" in progressive lenses?
✔✔The fitting cross marks where the wearer’s pupil aligns with the lens, guiding the optimal
positioning of progressive lenses.
Why might a patient require "aspheric lenses"?
✔✔Aspheric lenses are designed to be thinner and lighter, reducing distortion and improving
aesthetics for stronger prescriptions.
What is "photochromic lens" technology?
✔✔Photochromic lenses darken in sunlight and return to clear indoors, providing convenience
and protection from UV rays.
What is the importance of "vertex distance" in lens fitting?
✔✔Vertex distance is the space between the lens and the eye; it affects lens power, especially in
higher prescriptions.
What does "optical center" mean in eyeglass lenses?
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