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NAO VOLUME 3 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | RATED A+
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NAO VOLUME 3 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | RATED A+ What is the main purpose of an optical prescription? An optical prescription is a written order specifying the refractive power of lenses needed to correct a patient's vision. What does "OD" mean on a prescriptio...

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  • November 4, 2024
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  • 2024/2025
  • Exam (elaborations)
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NAO VOLUME 3 QUESTIONS AND
ANSWERS | LATEST VERSION |
2024/2025 | RATED A+
What is the main purpose of an optical prescription?


✔✔An optical prescription is a written order specifying the refractive power of lenses needed to

correct a patient's vision.




What does "OD" mean on a prescription?


✔✔OD stands for "oculus dexter," which is the Latin term for the right eye.




How is "astigmatism" corrected in lenses?


✔✔Astigmatism is corrected by using cylindrical lenses that adjust for uneven curvature in the

eye’s cornea or lens.




What is "prism" in an optical prescription?


✔✔Prism refers to a special adjustment in lenses to help align the eyes correctly and correct for

issues like double vision.




1

,Why are bifocal lenses used?


✔✔Bifocal lenses are used to correct both distance and near vision, often needed for people with

presbyopia.




What does the abbreviation "ADD" mean in an optical prescription?


✔✔ADD stands for the added magnifying power in a prescription, typically used for near-vision

correction in multifocal lenses.




What is the role of an anti-reflective coating on lenses?


✔✔An anti-reflective coating reduces glare and reflections, improving clarity and comfort in

different lighting conditions.




How does a progressive lens differ from a bifocal?


✔✔Progressive lenses provide a smooth transition between multiple focal points without visible

lines, unlike bifocals, which have distinct segments.




What does "spherical equivalent" mean in optics?


✔✔The spherical equivalent is a simplified prescription to approximate the refractive power of a

lens for people with minor astigmatism.

2

, What are "photochromic" lenses?


✔✔Photochromic lenses are lenses that darken in response to sunlight and clear up in lower

light, providing automatic protection against UV rays.




What does a "base curve" refer to in lenses?


✔✔The base curve is the curvature of the back surface of a lens, crucial for fitting and comfort,

as well as the overall optical quality.




How is lens power measured?


✔✔Lens power is measured in diopters, which indicate the refractive strength needed to focus

light onto the retina.




What is the purpose of "polarized" lenses?


✔✔Polarized lenses reduce glare from reflective surfaces, such as water or roads, enhancing

visual clarity and comfort.




What type of lenses would someone with presbyopia typically need?




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