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?
3
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SterlingScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.71. You're not tied to anything after your purchase.