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NAO Volume 2 Questions and Answers | Latest Update | 2024/2025 | 100% Pass
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NAO Volume 2 Questions and Answers | Latest Update | 2024/2025 | 100% Pass What does the term "vertex distance" refer to in optics? Vertex distance is the space between the back surface of a spectacle lens and the front of the eye, impacting how lenses correct vision. How does a convex len...

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  • November 4, 2024
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  • 2024/2025
  • Exam (elaborations)
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NAO Volume 2 Questions and Answers |
Latest Update | 2024/2025 | 100% Pass

What does the term "vertex distance" refer to in optics?


✔✔Vertex distance is the space between the back surface of a spectacle lens and the front of the

eye, impacting how lenses correct vision.




How does a convex lens help in vision correction?


✔✔A convex lens, which is thicker in the middle, converges light rays and is used to correct

farsightedness.




What is the purpose of a concave lens in eyewear?


✔✔A concave lens, which is thinner in the center, diverges light rays and corrects

nearsightedness.




What does "PD" stand for in optics, and why is it measured?


✔✔PD stands for Pupillary Distance, measured to ensure the lenses align correctly with the

patient’s eyes for optimal vision.




1

,Why might a patient require prism in their lenses?


✔✔Prism is added to lenses to correct issues with eye alignment, helping patients with double

vision or eye strain.




What is a "focal point" in an optical lens?


✔✔The focal point is where light rays passing through a lens converge, critical for creating clear

images on the retina.




How does lens curvature affect its function?


✔✔Lens curvature determines its refractive power; steeper curves increase the lens's ability to

bend light, correcting various vision issues.




What is the importance of the "optical axis" in a lens?


✔✔The optical axis is the straight line that passes through the center of a lens, essential for

aligning lenses correctly in eyewear.




What are high-index lenses, and why might they be prescribed?


✔✔High-index lenses are made from materials that bend light more efficiently, allowing them to

be thinner and lighter for higher prescriptions.

2

, What does "spherical power" indicate on a lens prescription?


✔✔Spherical power corrects nearsightedness or farsightedness, indicated by a positive or

negative value on the prescription.




What is "cylinder power" in an optical prescription?


✔✔Cylinder power corrects astigmatism by adjusting the lens shape to focus light more

precisely on the retina.




Why are anti-reflective coatings added to lenses?


✔✔Anti-reflective coatings reduce glare from lights, improving clarity, especially in low-light

conditions or for screen use.




What does "optical clarity" mean in relation to lens quality?


✔✔Optical clarity refers to how well a lens transmits light without distortion, crucial for

ensuring clear vision.




What is "refraction," and why is it important in optics?




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