NAO VOLUME 3 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | RATED A+
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Module
NAO VOLUME 3
Institution
NAO VOLUME 3
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...
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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