Quiz 3 Flashcards
Most ophthalmic lenses have no aberrations.
a. True
b. False
b. False
Chromatic aberration a result of the nature of the material from which lens is made.
a. True
b. False
a. True
Spherical aberration results from the lens having different powers in different areas of the lens.
a. True
b. False
a. True
The refracting power of a lens decreases toward the periphery.
a. True
b. False
b. False
The pupil of the wearer reduces the effect of spherical aberration.
a. True
b. False
a. True
An aspheric front surface of a plus lens steepens toward the periphery
a. True
b. False
b. False
In coma, the aberration is a result of rays of light parallel to the lens surface.
a. True
b. False
b. False
In coma, the aberration is a result of rays of light oblique to the lens surface.
a. True
b. False
a. True
In coma, the pupil of the wearer has no effect on the aberration.
a. True
b. False
b. False
In curvature of field, the image is curved.
a. True
b. False
a. True
In distortion, the object will appear to have a pincushion look when viewed through a minus lens.
a. True
b. False
b. False
Conventional slab off is available in quarter diopter steps.
a. True
b. False
a. True
Reverse slab off is available in half diopter steps.
a. True
b. False
a. True
In Dissimilar Segs and Compensated R Segs, the seg with the optical center closest to the top of the seg center in place in lens with the most plus power.
Hint: The answer is False
a. True
b. False
b. False
For the following Rx:
OD -4.00 -2.00 x045 Add +2.00 OU
OS -4.50 -4.00 x180 RL 8mm
Determine Vertical Imbalance:
a. -5.00
b. -8.00
c. 3.50
d. 2.8
d. 2.8
For the following RX:
OD -4.00 -2.00 x045 Add +2.00 OU
OS -4.50 -4.00 x180 RL 8mm
Determine Conventional Slab off:
a. 5.00 BU OD
b. 3.50 BU OS
c. 2.8 BU OS
d. 2.8 BU OD
c. 2.8 BU OS
For the following Rx:
OD -4.00 -2.00 x045 Add +2.00 OU
OS -4.50 -4.00 x180 RL 8mm
Detemine Reverse Slab Off:
a. 5.00 BD OD
b. 3.50 BD OS
c. 2.8 BD OS
d. 2.8 BD OD
d. 2.8 BD OD
AR coatings help eliminated specular reflections.
a. True
b. False
a. True
The higher the index of refraction of the lens, the greater the amount of specular reflection will occur.
a. True
b. False
a. True
