Practice Exam Flashcards
Visible light is in the range of wave lengths approximately:
a. 200 to 380 nanometers
b. 200-700 nanometers
c. 380 to 760 nanometers
d. 400 to 600 nanometers
380 to 760 nanometers
The reason that you see a red color when you look at a red rose is that:
a. Red waves are refracted by the rose
b. Red waves are reflected from the rose while all other colors are absorbed
c. Red waves are absorbed as the roses and all others are reflected
d. Red waves are longer so they are dispersed evenly across the petals
Red waves are reflected from the rose while all other colors are absorbed
Put the following in correct prescription notation:
a. +5.00 -.50 x 145
b. 3.00 +0.25 x010
c. -4.00 -1.00 x12
d. +1 -2 x 5
+5.00 -0.50 X 145
+/-3.00 +0.25 x 010
-4.00 -1.00 x 012
+1.00 -2.00 x 005
List the characteristics of a plus cylindrical lens:
Thick center / thin edge, converges light, against motion, magnifies, corrects hyperopia, scissor effect
Define abbe value and why is it important.
Number assigned to a lens material - the higher the number the less chromatic aberration they have
Given the following Rx: +1.25 -0.50 x 010
Transpose Rx: +0.75 +0.50 x 100
Place on an optical Cross:
\+0.75 100
I
L\_\_\_\_\_\_\_ +1.25 010
Name the refractive error:Compound hyperopic astigmatism
- 2.50 high index lass lens is heavier than a crown glass lens of equal thickness.
a. True
b. False
True
Arrange these materials in order from the material with the highest index of refraction to the material with the lowest index of refraction:
a. Crown glass
b. Polycarbonate
c. CR-39
d. Trivex
e. Thin & lite 1.71
Cr-39 Crown glass Trivex Polycarbonate Thin & lite 1.71
What is the minimum thickness requirement mandated for dress eyewear?
a. 1.0 mm
b. 1.5 mm
c. 2.0 mm
d. 3.0 mm
e. No minimum
No minimum
Which agency mandates the impact resistance for lenses?
a. ANSI
b. FDA
c. FTC
d. OSHA
FDA
Eyeglasses II no longer lists the minimal information needed for a spectacle lens prescription as found in Eyeglasses I:
a. True
b. False
True
The “duty to inform” someone of the safest options for their eyewear needs is:
a. A legal responsibility
b. A professional responsibility
c. Both
A professional responsibility
What are the basic-impact safety eyewear minimum thickness?
a. 2.0 mm
b. 2.2 mm
c. 3.0 mm
d. 3.2 mm
3.0 mm
How must a safety frame suitable for high impact safety lenses be marked on the front and the temples?
a. Size and manufacturer
b. Size, manufacturer and Z87
c. Size, manufacturer and Z87+
d. Size, manufacturer and Z87-2
Size, manufacturer and Z87-2
Which muscle is responsible for turning the eye towards the nose?
a. Inferior rectus
b. Lateral rectus
c. Medial rectus
d. Superior rectus
Medial rectus
What are the three general eyewear categories?
Dress, safety, sports
What are two disadvantages of glass lenses?
Heavyweight and doesn’t tint
Lens material classified by index of refraction, what are these classifications?
Low index, mid index, high index, ultra high index
What are the FDA regulations for dispenser record keeping?
Record must be kept for three years
Explain why polycarbonate is a high impact resistant material.
The nature of the material is softer so it will bend before breaking
For which patient groups is visual safety a major concern?
Monocular individuals, athletes, children certain occupations, people that have had ocular surgeries or traumas
Given:
+2.00 x 110
L\_\_\_\_\_\_\_ +4.00 x 20
- Write Rx in minus cylinder form:
- Name the refractive error:
- +4.00 -2.00 X 020
2. Compound hyperopic astigmatism
Write Rx to correct:
a. Myopia:
b. Simple hyperopic astigmatism:
a. -4.00 Sph
b. PL -1.00 x 045
Transpose the following:
a. -1.50 +1.00 x 035
b. +2.00 -3.00 x 165
a. +0.50 -1.00 x 145
b. -1.00 +3.00 x 175
Name another lens material besides polycarbonate that are also impact resistant:
Trivex, NXT
What are the three things that can happen to a ray of light?
Reflected, refracted, absorbed
What is the law of refraction?
Angle of incidence equals angle of reflection
What are the three laws of refraction?
When a ray passes through a medium perpendicular to the surface, it slows down
Goes from less dense to more dense, bends towards the normal
Goes from more dense to less dense, bends away from the normal
We use the acronym ROY G BIV to help remember the order of the colors. It lists colors that have wavelengths from-to:
a. Long wavelength (Around 700nm) to short wavelength (around 400nm)
b. Short wavelength (around 400nm) to long wavelength (around 700nm )
Long wavelength (Around 700nm) to short wavelength (around 400nm)
Which wave length of ultra-violet radiation is absorbed by the ozone layer?
a. UV-A
b. UV-B
c. UV-C
UV-C
What is the optician’s responsibility in regards to inspecting newly made eyeglasses?
All factors of the Rx are to be checked. If an eye injury occurs and any standards are not met, the Rx wasn’t inspected and/or was fabricated incorrectly
