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NAO VOLUME IV QUESTIONS AND ANSWERS-
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NAO VOLUME IV QUESTIONS AND ANSWERS
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NAO VOLUMEIV QUESTIONS
AND ANSWERS
The amount of reflection of each surface of CR-39 plastic lenses is approximately: -
Answers- 4%
The absorption of light in lenses is classified by two variables. What are they? -
Answers- Tint and lens transmission
The denser the tint in a lens, the _____: - Answers- Less transmission of light through
the lens
Standard transmission in sunlenses should range between: - Answers- 15% and 30%
If a person has exposure to sunlight at least 2 hours or more during the day, their _____
- Answers- Ability to adapt to night vision is compromised if they don't protect their eyes
from the sun exposure
A characteristic of a dark tinted glass lens with an RX of +4.00D sphere would b_____ -
Answers- Dark in the center and lighter on the edge
Given a high plus or minus RX, which lens material would offer the best choice for
uniform density in a sunlens? - Answers- cr-39 plastic and trivex
Although this may be the most popular color for sunlenses, it is not recommended for
patients with emerging cataracts: - Answers- gray
_____ added to any color increases contrast: - Answers- yellow
_____ is better than _____ for improving contrast: - Answers- green
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