Review Questions Flashcards
A +3.00 D Sph -3.00 D Cyl X 180 will have what scissors motion on the
180th meridian?
A. Against
B. With
C. Neutral
With
Prism used to strengthen a weak eye muscle.
A. dissociating prism
B. measuring prism
C. relieving prism
D. adverse prism
Adverse prism
It is a round segment bifocal.
A. kryptok
B. Fat top
C. executive
D. blended
Kryptok
How do you specify a bifocal segment height?
A) Just give the standard height of 12 mm. It always works.
B) Measure from the lower pupil margin to the lower rim of the frame.
C) Measure from the pupil center to the lower rim of the frame
D) Measure from the lower lid margin to the lower rim of the frame.
Measure from the lower lid margin to the lower rim of the frame.
What tint could enhance contrast and color discrimination of
protanopes?
A. deep blue
B. deep red
C. deep green
D. deep gray
Deep red
Which of the following is an erroneous cross-cylinder?
A) +1.25 D Cyl X 90 -1.00 D Cyl X 180
B) +3.00 D Cyl X 62 +5.00 D Cyl X 152
C) +4.50 D Cyl X 54 +4.50 D Cyl X 120
D) -2.00 D Cyl X 140 -1.00 D Cyl X 50
+4.50 D Cyl X 54 +4.50 D Cyl X 120
What is the distance of the principal focus to the lens?
A. Interval of Sturm
B. focal length
C. Conoid of Sturm
D. focal difference
focal length
What do you call the power of a lens when you add the powers of the front and back surfaces?
A. front vertex power
B. back vertex power
C. equivalent power
D. nominal power
Nominal power
A lens prescription has these conditions:
1. The sphere and cylinder have equal power but opposite in sign.
2. The cylinder has a plus sign.
What is the astigmatism of the patient?
A. Simple Hyperopic Astigmatism
B. Simple Myopic Astigmatism
C. Compound Hyperopic Astigmatism
D. Mixed Astigmatism
E. Compound Myopic Astigmatism
Simple Myopic Astigmatism
Which of the following is TRUE of HMC lenses?
A) It decreases reFection and decreases transmission of light.
B) It increases absorption and decreases reFection of light.
C) It decreases absorption and decreases reFection of light.
D) It decreases reFection and increases transmission of light.
It decreases reFection and increases transmission of light.
In a -2.00 D Sph -2.00 D Cyl X 90, how would you describe the 180
meridian? Choose two (2)
A) It has the thickest edge.
B) It has the thinnest edge.
C) It has the weakest minus.
D) It has the greatest minus.
It has the thickest edge.
It has the greatest minus.
A doctor recommends a progressive lens that has a minimum fitting height (MFH) of 18mm. After adjusting the frame, the pupillary is about 21mm.
True or False: The chosen progressive will NOT fit into the frame.
False
Which of the following describes a curve with a short radius? Flat or steep?
Steep
What is the principle employed in making an antireflective lens?
A. light nullification
B. light reduction
C. wave interference
D. wave transmission
Wave interference
Which of the following equation is equal to the pd of the frame?
A) A Diameter + B Diameter
B) Effective Diameter + dbl
C) eyesize + dbl
eyesize + dbl
A base down prism will illicit the eye to turn on which direction?
A. upward
B. inward
C. outward
D. downard
Upward
True or False: The axis notation of a cylinder of the right eye is clockwise and counter-clockwise on the left eye.
False
A -5.50D Sph has a back curve of -8.00 D. What is the base curve of the lens?
A) +13.50
B) +2.50
C) -13.50
D) -6.50
E) +6.50
F) -2.50
+2.50
Polycarbonate is often considered to be dispensed in which of the ff?
A) where environmental safety is required
B) those you require the highest optical performance
C) for those who use the digital devices a lot
D) those living in high altitude
When environmental safety is required
A patient has two separate eyeglasses for distance and near. The
distance has a power of -3.50 D Sph -1.50 D Cyl X 90. His reading glass is -3.00 D Sph +1.50 D Cyl X 180. What is the reading add power?
A) +0.50
B) +1.00
C) +1.50
D) +2.00
E) +2.50
+2.00
What type of lens edging is needed for a fullrim frame?
A. flat
B. bevel
C. grooving
Bevel
Which of the following is true about soft design progressives?
A) It is best for first time PAL users.
B) It is a balanced progressive.
C) It is only good for experienced pal wearers.
It is best for first time PAL users.
Who is credited for the invention of the bifocal?
A) Isaac Newton
B) Galileo
C) Thomas Maxwell
D) Benjamin Franklin
Benjamin Franklin
How do you describe a light with a positive vergence?
A. parallel
B. convergent
C. divergent
Convergent
What do you call the meridian with the highest power?
Power
A lens exhibits an against parallax motion. Which of the following is true? (Hand neutralization)
A) The lens is a converging lens.
B) The lens is thinner at the center.
C) The lens has no scissor’s motion.
D) The lens corrects myopia.
The lens is a converging lens.
Which light has the fastest speed?
A. green
B. violet
C. red
D. yellow
Red
It is a D Segment bifocal that offer lower amount of image jump when compared to a Round Segment.
A. Kryptok
B. Executive
C. Flat Top
D. Blended
Flat Top
Which among the following are not paired meridians?
A) 45 & 135
B) 18 & 98
C) 126 & 36
D) 174 & 84
18 & 98
It is the body of the temple.
A. shaft
B. curl
C. earpiece
D. butt
Shaft
It is a test for the impact resistance of a lens.
A) tensile strength test
B) flex test
C) resistance test
D) drop ball test
Drop ball test
Which among the lens materials are considered impact resistant?
Choose all that apply.
A. trivex
B. polycarbonate
C. hi-index
D. cr-39
Polycarbonate
True or False: A lens that is multicoated blocks UV rays.
False
What serves as the axis of a prism?
A) prism axis line
B) refracting line
C) line of sight
D) base apex line
Base apex line
A patient reports he sees better with his progressives when the frame is slight down. What frame adjustment would you make?
A) do a faceform
B) shorten the temple length
C) open the nose pads
D) do a pantoscopic tilt
Open the nose pads = spread; frame/lens moves lower
What is the power on the principal meridians of this lens : +1.25 D Sph -2.00 D Cyl X 180?
A) M180 : -1.25 D / M90 : +0.75 D
B) M180 : +0.75 D / M90 : -1.25 D
C) M180 : +1.25 D / M90 : -0.75 D
D) M180 : -0.75 D / M90 : +1.25 D
M180 : +1.25 D / M90 : -0.75 D
-3.50 D Sph -7.25 D Cyl X 42 is similar to which of the following?
A) -3.50 D Cyl X 42 -10.75 D Cyl X 42
B) -10.75 D Sph +7.25 D Cyl X 132
C) -3.50 D Cyl X 132 +3.75 D Cyl X 42
D) -10.75 D Sph +7.25 D Cyl X 42
-10.75 D Sph +7.25 D Cyl X 132
When prescribing a spherical equivalent, what would be the refractive condition of the eye?
A) compound hyperopia
B) compound myopia
C) mixed astigmatism
D) simple myopia
E) simple hyperopia
Mixed astigmatism
It is the horizontal diameter of the frame and is specified in millimeter.
A. distance between centers
B. eyesize
C. distance between lenses
D. minimum blank size
Eyesize
Adding the dbl and eyesize will give the ___.
A) B size
B) C size
C) A size
D) None of the above
None of the above
A patient has a pd of 66mm. His eyeglass is OU: -5.00 D Sph and PD: 60mm. What prism power will be created?
A. base in
B. base out
C. base up
D. base down
Base out
In a cylinder lens, describe the power changes from the power meridian to the axis meridian.
A. It gradually increases.
B. It gradually decreases.
It gradually decreases.
In a sphero cylinder lens, the power on the axis meridian is equal to which of the following?
A. sphere
B. cylinder
C. sphere + 1/2 (cylinder)
D. sphere + cylinder
Sphere
Which of the following is TRUE about radius & curvature?
A) Curvature is directly proportional with radius
B) Curvature is inversely proportional with radius
C) Shorter radius produces a Fatter curvature
D) Longer radius produces a steeper curvature
Curvature is inversely proportional with radius
A patient reports that he feels as if he is shorter than his surroundings when wearing his prescription. Which of the following is true?
A) His prescription has excessive Base Down.
B) His prescription has inward decentration.
C) His prescription has outward decentration.
D) His prescription has excessive Base Up.
His prescription has excessive Base Down.
In a +1.50 D Sph -2.00 D Cyl X 90, what is the parallax motion on M90?
A. against
B. neutral
C. with
With
The reading add is always indicated on which side of the progressive lens?
A) nasal
B) temporal
C) od: nasal os: temporal
D) od: temporal os: nasal
Temporal
What is the parallax motion of a plus lens?
A. neutral
B. against
C. with
Against
A patient has -6.00 D prescription. He says that he sees better when he moves his eyeglasses away from his eyes. Which of the following is true?
A) His lens material is damage.
B) He is over corrected.
C) He has a wrong pd.
D) He is under-corrected.
He is over corrected.
2.50 D and 1.00 D in front of the retina. Write the lens prescription in (-) cyl.
A) -2.50 D Sph -1.50 D Cyl X 90
B) -1.00 D Sph -1.50 D Cyl X 180
C) -2.50 D Sph -1.50 D Cyl X 180
D) -1.00 D Sph -1.50 D Cyl X 90
-1.00 D Sph -1.50 D Cyl x 180
