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...
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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