NAO Volume II 2024/2025 study guide with verified answers 100% correct!
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Course
NAO
Institution
NAO
What is the central layer of an iZon lens made of?
A. A Hartman-Shack lens set array
B. 1.60 index plastic
C. Zernike Polynomials
D. A liquid polymer - correct answer D. A liquid polymer
Asborption - correct answer When a ray of light enters a lens some of the light
will not completely travel...
NAO Volume II 2024/2025 study guide with verified
answers 100% correct!
What is the central layer of an iZon lens made of?
A. A Hartman-Shack lens set array
B. 1.60 index plastic
C. Zernike Polynomials
D. A liquid polymer - correct answer D. A liquid polymer
Asborption - correct answer When a ray of light enters a lens some of the light
will not completely travel through the lenses
Deviation (angle of) - correct answer The angle a ray of light is changed from its
original path
Diffuse Reflection - correct answer A reflection from a rough surface-the
reflection does not produce a clear image
Incidence - correct answer The angle which a ray of light makes with the surface
of a refracting medium
Reflection - correct answer The return of light waves from a surface. The
production of an image
Refraction - correct answer The bending of light when going from one medium
into another.
(Angle of)Refraction - correct answer The angle created when a ray of light passes
from one medium into another
Specular Reflection - correct answer The forming of a clear image when light
strikes a surface
When is the pencil red? - correct answer It reflects the red rays back toward the
eye and absorbs all other rays of visible light
Why is the blacktop black? - correct answer It does not reflect any rays back
toward your eye; rather, it absorbs them all
If a light beam passes through a green sunglass lenses, why will the light exiting
light be green? - correct answer The green rays are refracted through the lens
and all other color rays are absorbed by the pigments in the lens material.
What does critical angle mean? - correct answer A light of ray leaving a denser
material for a rarer material that is at an angle to the normal that results in it
traveling parallel to the surface of the material. If the angle of incidence is greater
than the critical than the critical angle the ray will reflect inside the material and
will not exit into the rarer material.
Focal Power Formula - correct answer D=1/f
Power in Oblique meridians - correct answer TP=sphere power +cylinder power x
sin(2) squared
,NAO Volume II 2024/2025 study guide with verified
answers 100% correct!
Snell's Law - correct answer N1 sin I = N(2) sin r
Law of reflection - correct answer angle i = angle r
Prentice Rule - correct answer Prism = (h+D)/10
Nominal power - correct answer D(e) = D(1)+D(2)
Frame PD - correct answer FPD = A +DBL
Binocular decentration - correct answer Dec= (FPD-PPD)/2
Index of refraction - correct answer speed of light in air/speed of light in medium
Minimum black size - correct answer MBS= ED + (2xDec)
What is the difference between a high index lens and an aspheric lens? - correct
answer High index refers to the material of the lens; aspheric refers to the surface
design of the lens
What are the three things that can happen to a ray of light when it passes through
a lens? - correct answer Reflection, Absorption, Refraction
What role does the FDA (food & drug administration) play in the ophthalmic
industry? - correct answer They are responsible for the lens safety aspect of the
industry. Impact resistant is their main focus.
According to the Systems text, eyewear can be divided in to what three
categories? - correct answer Dress eyewear: Designed for everyday use
Safety eyewear: Designed to meet the standard of impact resistance since it will
be worn in situations that could be potentially hazardous to the eyes
Sports eyewear: Designed to protect the eyes or enhance the vision in specific
sports situations.
What is transposition? - correct answer The changing of a prescription from plus
cylinder to minus cylinder or the other way around (there is no effect on the
powers of the prescription).
What type of image is formed by a minus lens? - correct answer Virtual
A plus lens does what to light rays that pass through it? - correct answer Makes
them converge
What does the term critical angle of a material mean? - correct answer The ray of
light is striking the surface of an angle so that the ray is refracted along the
surface of the lens.
A minus lens with the optical center moved up creates? - correct answer Base
down prism
What three things does base up prism cause? - correct answer 1. Bends light
towards the base
2. Bends light rays away from the apex
, NAO Volume II 2024/2025 study guide with verified
answers 100% correct!
3. Projects an image of the object downwards
What are the wavelengths visible light range? - correct answer 400-720
nanometers
What are the wavelengths are that most pleasing to the eye? - correct answer
Blue-Green
The breakdown of light into its component colors is known as? - correct answer
Dispersion
The point on a lens which a ray of light will pass through without being deviated is
called? - correct answer Optical center
The lower the Abbe value, the .............. - correct answer More the chromatic
aberrations
Which lens has the characteristic of magnification? - correct answer Plus
spherical
Which lens has the characteristic of thin center/thick edge? - correct answer
Minus spherical
Which lens has the characteristic of diverging light rays? - correct answer Minus
spherical
Which lens has the characteristic of with motion? - correct answer Minus
spherical
The lens design in which the front base curve gradually flattens is called? - correct
answer aspherical
Rounded frames are recommended for high minus lenses and squared frames are
recommended for high plus lenses.
True or False - correct answer False
The lower the frame bridge, the greater the effect of.........? - correct answer
Shortening the nose
Which type of temple curves around the ear following the crotch of the ear where
war and head meet, extending to the level of the earlobe? - correct answer
Riding bow
Which frame material can be made thin and lightweight, with frame colors that
are primarily opaque? Some problems may be encountered with breakage in cold
weather/ - correct answer Carbon fiber
Is a lighter colored, more delicately styled frame recommended for a person with
light, fine hair? - correct answer Yes
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