THEORETICAL OPTICS 2 Flashcards
1
Q
A barrel type distortion is seen in which type of lens?
A. high minus lens
B. high plus lens
C. cylinder lens
D. plano lens
A
A
2
Q
- Given a –3.50 Cyl x 180, find the power in the 120th meridian.
A. - 2.28 D
B. - 2.62 D
C. -1.75 D
D. -3.12 D
A
B
3
Q
- Lens with low abbe value will have:
A. low chromatic aberration
B. high chromatic aberration
C. low spherical aberration
D. high spherical aberration
A
B
4
Q
The arched piece in front of the frame which connects the eye wires and support most of the
weight of the eyeglasses.
A. Pad arms
B. Temples
C. End piece
D. Nose bridge
A
D
5
Q
- Compute for the equivalent power of a lens with surface powers of +8.00 D and +3.00 D,
center thickness of 5 mm and an index of refraction of 1.5.
A. +10.44 D
B. +11.92 D
C. +11.08 D
D. +10.92 D
A
D
6
Q
- Metallic oxide used to produce green tint on a glass lens:
A. cobalt oxide
B. ferrous oxide
C. uranium oxide
D. cerium oxide
A
B
7
Q
The minimum blank size of a lens needed for a frame with 52mm effective diameter and a
decentration of 3mm.
A. 60 mm
B. 65 mm
C. 70 mm
D. 55 mm
A
A
8
Q
- The horizontal distances between the geometric centers of the lenses.
A. DBL
B. Frame PD
C. Effective diameter
D. Eyesize
A
B
9
Q
- Type of bifocal lens which has the lowest/ no image jump?
A. Ultex bifocals
B. Executive bifocals
C. Flat top bifocals
A
B
10
Q
Find the Nominal Power of a lens having lens surfaces of +6.00 D and a back surface of –
2.00 D.
A. + 6.00 D
B. -8.00D
C. -12.00D
D. +4.00D
A
D
11
Q
- The first bifocal lenses invented by Benjamin Franklin?
A. Split bifocal
B. Cemented bifocal
C. Solid bifocal
D. Fused bifocal
A
A
12
Q
- Refers to the sudden change or shift in image location when looking from distance to the
segment area of the lens.
A. Inset
B. Displacement
C. Decentration
D. Image jump
A
D
13
Q
A lens has a front surface of +12.00 D and a back surface of -5.00 D with a center thickness
of 7mm and index of refraction of 1.6.Compute for the back vertex power.
A. + 8.25D
B. +7.63D
C. +7.23D
D. +7.10D
A
B
14
Q
- What type of lens is to be prescribed to reduce spherical aberrations and distortions?
A. Spherical lens
B. Aspheric lens
C. Achromatic doublet
D. Curved lens
A
B
15
Q
Silver halides are the major components of this type of lens:
A. Polarized lens
B. Photochromic lens
C. Mirror coated lens
D. UV coated lens
A
B
16
Q
- Given a –4.00 = -2.00 Cyl x 90, find the power in the 45th meridian.
A. -2.00 D
B. - 3.00 D
C. -5.00 D
D. -6.00D
A
C
17
Q
The non-uniform focusing of different wavelengths in a lens.
A. chromatic aberration
B. coma
C. spherical aberration
D. curvature of field
A
A
18
Q
- A hard design progressive lens is characterized by:
A. narrow distance and near area with longer intermediate corridor
B. wider distance and near area with narrow intermediate corridor
C. lesser peripheral aberration
D. wider corridor
A
B
19
Q
The intermediate power in a trifocal lens with a prescription of -2.00 = -0.75 x 30 ADD 2.00
is:
A. -0.75 x 30
B. -0.75 x 120
C. -1.00 = -0.75 x 30
D. -1.00 = -0.75 x 120
A
C
20
Q
Substance used as an adhesive/binding agent for the early types of bifocals.
A. Wafer
B. Canada Balsam
C. Mighty bond
D. Black pitch
A
B
21
Q
- A lens with 1.6 index of refraction and a power of –6.00 D was tilted 30 degrees in a
pantoscopic form. What is the new sphere and the amount of the induced cylinder?
A. - 6.00D
B. -7.50
C. - 6.50 D
D. -7.25D
A
C
22
Q
The power of a cylinder lens in the meridian 90 degrees away from its axis contains:
A. no cylinder power
B. the total power of the cylinder
C. half the cylinder power
D. one fourth its cylinder power
A
B
23
Q
- The distance power of a progressive lens should be measured with the lensmeter at the:
A. Fitting cross
B. Distance reference point
C. Major reference point
D. Prism reference point
A
B
24
Q
A test to determine a lens impact resistance:
A. Thermodyne test
B. Moh’s hardness scale
C. Drop ball test
D. Gravity test
A
C
25
25. What is the effectivity in a plus lens moved towards the eye will?
A. increase plus power
B. decrease minus power
C. decrease plus power
D. have no change in power
C
26
A patient was refracted with a –4.00 D at a distance of 12 mm. In fitting the correcting lens, it
was placed at 8 mm instead. What will be the effective power of the lens in its new position?
A. -4.11 D
B. - 3.89 D
C. - 4.89 D
D. - 3.11D
A
27
27. Polarized lenses reduces glare by:
A. using silver halide as a component of the lens
B. permitting light to enter in one meridian only
C. using highly reflective coatings applied to the lens’ front surface
D. blocking harmful blue light
B
28
The first fused bifocal lens is:
A. Executive bifocal
B. Kryptok bifocal
C. Flat top bifocal
D. Ultex bifcoal
B
29
When a lens shape contains one concave surface and one convex surface, it is
called_________ lens.
A. toric
B. biconcave
C. biconvex
D. meniscus
D
30
30. Given a prescription of OU: -3.00 D Add +1.00, distance PD of 62mm and near PD of
60mm, compute for the total inset for a frames size of 45mm with DBL of 20mm.
A. - 1.5 mm
B. - 2.5 mm
C. - 3.5 mm
D. - 1.0mm
B
31
31. It is used to correct vertical imbalance by grinding the lens with a prism base up on the most
minus or least plus in the vertical meridian.
A. slab-off
B. reverse slab-off
C. dropping the distance O.C
D. dissimilar bifocal segments
A
32
It is the process of inserting or fitting a lens to a spectacle frame.
A. drilling
B. edging
C. chipping
D. glazing
D
33
33. Lenses coming from the manufacturer without either surface finished are called:
A. finished lenses
B. rough lenses
C. semi-finished lenses
D. stock lenses
B
34
If the patient looks 6 mm below the optical center of a lens with a prescription of OD: +2.50
D and OS: +4.00 D Add 1.00D, how much vertical imbalance is produced?
A. 3.9 prism diopter
B. 2.4 prism diopter
C. 0.9 prism diopter
D. 1.5 prism diopter
C
35
35. Where is the location of the segment optical center of a flat top bifocal?
a. At the center of the segment area
B. Exactly at the dividing line
C. 5 mm below the top portion of segment
D. At the lowest portion of the lens
C
36
These are contact lenses used to correct significant amount of astigmatism
A. Alternating vision
B. Toric
C. Spherical
D. Simultaneous vision
E. Option 1
B
37
Contact lens for presbyopes where in the dominant eye if fitted with distance correction and
the non-dominant eye is fitted with correction for near.
A. Alternating vision
B. modified monovision
C. Monovision
D. Simultaneous vision
C
38
Contact lens modality that provides patients with ease and convenience wear without
cleaning for a period of time such as one week or one month.
A. Continuous wear
B. Daily disposable
C. Disposable wear
D. Extended wear
A
39
39. These contact lenses promotes healing of a variety of corneal diseases
A. Bandage contact lenses
B. Cosmetic contact lenses
C. Silicone hydrogel lenses
D. Prosthetic contact lenses
A
40
40. A type of contact lens that has RGP central zone and soft or silicone hydrogel peripheral
zones
A. Alternating bifocal contact lens
B. Hybrid contact lenses
C. Ortho-k contact lenses
D. scleral lenses
B
41
The curvature of the contact lens that determines alignment between the back surface of the
lens and the front surface of the cornea
A. Base Curve
B. Peripheral Curve Radius
C. Peripheral Curve Width
D. Optic Zone
A
42
42. Which of the following statement is true in soft hydrogel contact lenses
A. high water contact lenses are ideal for patients with dry eye
B. High water content contact lenses are more durable that low water content
C. High water contact lenses allows more oxygen to pass through the materials
D. Low water are more flexible that high water contact lenses
C
43
43. Which of the following conditions is a result of corneal hypoxia due to contact lens wear
A. Contact lens induced peripheral ulcer
B. Microbial keratitis
C. polymegethism
D. Pterygium
C
44
Contact lenses with low DKs _____.
A. Are Durable
B. Are more rigid than high DK
C. Can result to corneal hypoxia
D. Does not require lubricating solutions
C
45
45. Minimum EOP for extended wear contact lenses
A. 9%
B. 12%
C. 13%
D. 15%
B
46
What is the power of a contact lens to be prescribed if manifest refraction is -5.75 if the
vertex distance of the trial frame used is 13 mm
A. -5.00
B. -5.25
C. -5.50
D. -6.00
B
47
If manifest refraction using a frame with 13 mm vertex distance resulted to -1.00/-0.50 x 180,
what is the power of a soft contact lens to be prescribed?
A. -1.00 Sph
B. -1.25 Sph
C. -1.50 Sph
D. -1.00/-0.50 x 180
B
48
48. Give the power of a soft contact lens to be prescribed if the manifest refraction using a
vertex distance of 13 mm is -5.75/-1.00 x 90
A. -5.25/-1.00 x 90
B. -5.75 Sph
C. -5.75/-1.00 x 90
D. -6.25 Sph
B
49
What is the power of a contact lens to be prescribed if manifest refraction is -5.50/-4.25 x
180 if the vertex distance of the trial frame used is 12 mm
A. -7.00 Sph
B. -7.50 Sph
C. -5.25/-3.50 x 180
D. -5.50/-4.25 x 180
C
50
50. What is the power of a contact lens to be prescribed if manifest refraction is -2.50/-1.25 x
180 if the vertex distance of the trial frame used is 12 mm
A. -2.75 Sph
B. -3.00 Sph
C. -2.75/-.0.75 x 180
D. -2.50/-1.25 x 180
D
51
What does a TBUT of 5 sec indicates?
A. Evaporative dry eye
B. Lacrimal gland atrophy
C. Goblet cells of the conjunctiva deficiency
D. Gland of Krause and Wolfring defect
A
52
52. What does a Schirmer’s test result of 10 mm indicate?
A. Aqueous dry eye
B. Evaporative dry eye
C. Keratitis
D. Normal ocular surface
A
53
What does a TBUT of 12 sec indicate?
A. Aqueous dry eye
B. Evaporative dry eye
C. Keratitis
D. Normal ocular surface
D
54
54. What is the normal corneal shape if the patient has not undergone any refractive surgery or
orthokeratology?
A. Parabolic
B. Prolate
C. Oblate
D. Spherical
B
55
55. The following can be used to check corneal regularity EXCEPT?
A. Burton lamp
A
56
What does warm colors in corneal topography indicates?
A. Corneal asphericity
B. Flat curves
C. Irregular zones
D. Steep curves
D
57
. Warm colors appearing as vertical bowtie in corneal topography indicates _____.
A. Against the rule astigmatism
B. Irregular astigmatism
C. Oblique astigmatism
D. With the rule astigmatism
D
58
58. Distorted reflection in Placido disc indicates the following conditions EXCEPT?
A. Corneal scar
B. Irregular corneal surface
C. Keratoconus
D. Spherical corneal surface
D
59
What is the disadvantage of using keratometer in assessing topography of the cornea?
A. Peripheral cornea is not being assessed
B. Result is not reliable
C. The instrument is expensive
D. The measurement is not quantified
A
60
60. What is the radius of the steeper curve of the cornea in the following test results?
Keratometry findings H: 43.00@180 V: 45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance
of 12 mm)
A. 7.46
B. 7.56
C. 7.65
D. 7.84
A
61
Compute for the radius of the flatter corneal curve. Keratometry findings H: 43.00@180 V:
45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance of 12 mm)
A. 7.46
B. 7.56
C. 7.65
D. 7.84
D
62
62. What type of corneal astigmatism is present? Keratometry findings H: 43.00@180 V:
45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance of 12 mm)
A. Against the rule
B. oblique
C. irregular
D. With the rule
D
63
What is the correction for corneal astigmatism? Keratometry findings H: 43.00@180 V:
45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance of 12 mm)
A. -2.25 cx 180
B. -2.25 cx 90
C. -0.75 cx 90
D. -0.75 cx 180
A
64
Compute for the amount of residual astigmatism. Keratometry findings H: 43.00@180 V:
45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance of 12 mm)
A. -0.75 cx 180
B. -2.25 cx 180
C. -2.25 cx 90
D. -0.75 cx 90
A
65
What design of soft toric contact lens should be prescribed to this patient? Keratometry
findings H: 43.00@180 V: 45.25@90Refraction: -4.25/-3.00 x 180 (vertex distance of 12 mm)
A. Back toric design
B. Front toric design
C. Bitoric design
D. Toric periphery
A
66
66. Computer for the BOZR of the toric soft contact lens to be prescribed to this
patient?Keratometry findings H: 43.00@180 V: 45.25@90Refraction: -4.25/-3.00 x 180 (vertex
distance of 12 mm)
A. 7.85
B. 8.16
C. 8.55
D. 7.46
C
67
If the patient opted for orthokeratology, what will be the base curve of the contact lens to be
used if the lens has a jessen factor of 1.25 D? Keratometry findings H: 42.25@170 V:
46.25@80Refraction: -4.25/-0.50 x 180
A. 9.18
B. 8.88
C. 7.67
D. 6.63
A
68
The pupil size of the patient specially during scotopic conditions is important in _____.
A. Determining the BOZR
B. Determining the diameter of the optic zone
C. Determining the minimum contact lens diameter
D. Determining the peripheral curve and diameter
B
69
The following principles are applied in soft contact lenses, EXCEPT
A. BOZD is larger than the TD by 2 mm
B. Larger than the cornea
C. BOZR flatter than the flattest corneal curve
D. Minimal movement observed after blink is ideal
A
70
70. Spherical soft lenses can be prescribed if the amount of cylinder is _____ regardless of the
amount of the sphere.
A. Less than -1.00 D
B. -1.00 D
C. Less than -2.00 D
D. -2.00 D
A
71
Increasing the diameter of a optimum fitted soft contact lens without altering the BOZR will
make the fit
A. Steeper
B. Flatter
C. Optimum
D. none of the 3 choices
A
72
72. Longer sag without changing the BOZR can be achieved by
A. Aspheric design
B. Choose material with higher refractive index
C. Flatten the peripheral curve
D. Increasing the total diameter of the lens
D
73
The patient has a HVID of 11.8 mm and a VVID of 11.2 mm. When ordering a high water
content spherical contact lens, the ideal TD should be
A. 9.2 mm
B. 13.2 mm
C. 13.8 mm
D. 14.3 mm
D
74
74. The BOZR of the initial diagnostic corneal RGP lens to try should be _____.Keratometry
findings H: 43.00@180 V: 43.25@90Refraction: -2.00/-0.50 x 180HVID: 11.4 mm VVID: 11.0
mm
A. 7.80 mm
B. 7.85 mm
C. 8.50 mm
D. 8.55 mm
B
75
The power of the soft contact lens to be ordered is _____.Keratometry findings H:
43.00@180 V: 43.25@90Refraction: -2.00/-0.50 x 180HVID: 11.4 mm VVID: 11.0 mm
A. -2.25 Sph
B. -2.50 Sph
C. -2.00 / -0.50 x 180
D. -2.00 Sph
A
76
76. The following factors affects soft contact lens rigidity, EXCEPT
A. Base curve
B. Material
C. Manufacturing method
D. thickness
A
77
77. Which of the following spectacle refractions would likely benefit from spherical corneal RGP
contact lens
A. -0.50
B. -1.00 Sph
C. -2.50
D. -6.50 / -1.00 cx 180
D
78
A soft contact lens exhibits excessive in-eye movement. What is the remedy for this?
A. Decrease over-all diameter
B. Decrease Sag
C. Decrease thickness
D. Increase the BOZR
C
79
79. A soft contact lens exhibiting optimum fit with a BOZR of 8.7 with a diameter of 14.0 mm
was ordered. If the laboratory only carry contact lenses with 14.5 mm diameter, what will the
BOZR of the contact lens to be ordered?
A. 8.1 mm
B. 8.4 mm
C. 8.7 mm
D. 8.9 mm
D
80
80. What is the remedy for a steep fitted lens?
A. Decrease thickness
B. Increase BOZR
C. Increase Sag
D. Increase total diameter
B
81
A 3 cm object was placed at an infinite position facing a concave mirror. What will be the
nature of the image produced?
A. Real, inverted and magnified
B. Real point image
C. Virtual, erect and minified
D. Virtual point image
B
82
82. An object 4 centimeters in size is placed at an infinite point from and facing a convex mirror.
What will be the nature of the image produced?
A. Real, inverted and magnified
B. Real point image
C. Virtual, erect and minified
D. Virtual point image
D
83
Compute for the distance between the mirror and image formed in the mirror if the man is 5
feet 8 inches tall and he is standing at 43 inches away from the mirror.
A. 1 ft 9 inches
B. 3 ft 7 inches
C. 4 ft 2 inches
D. 5 ft 6 inches
B
84
84. What will be the image size of a man if the man is 5 feet 8 inches tall and he is standing 4
feet away from a plane mirror?
A. 60 inches
B. 63 inches
C. 68 inches
D. 72 inches
C
85
Compute for the number of images formed if an object placed between 2 inclined plane
mirrors separated 45 degrees from one another?
A. 2
B. 3
C. 4
D. 6
D
86
86. Compute for the minimum size of mirror needed so that a man 6 feet 2 inches tall will be
able to see his whole image and he is standing 3 feet 6 inches away from the mirror
A. 3.01 ft
B. 3.08 ft
C. 3.12 ft
D. 3.30 ft
B
87
What do you call the type of image that is produced in mirrors by prolonging the path of the
reflected or refracted ray?
A. inverted
B. Perverted
C. Real
D. Virtual
D
88
88. What is the term used to denote an image that is erect but laterally reversed?
A. inverted
B. Perverted
C. Real
D. Virtual
B
89
Yzabelle finds a convex mirror to stand in front of. She sees her image reflected 7 feet
behind the mirror which has a focal length of 11 feet. Her image is 1 foot tall. Compute how far
is Yzabelle from the mirror.
A. 3.90 ft
B. 9.10 ft
C. 19.25 ft
D. 29. 50 ft
C
90
Yzabelle finds a convex mirror to stand in front of and sees her image reflected 7 feet
behind the mirror which has a focal length of 11 feet. Her image is 1 foot tall. How tall is
Yzabelle?
A. 2.25 ft
B. 4.30 ft
C. 5.6 ft
D. 6.1 ft
A
91
91. An object placed 30 cm from the mirror produced an image behind the mirror which is erect
and three times larger than the object. What is the focal length of this mirror?
A. 30 cm
B. 45 cm
C. 65 cm
D. 90 cm
B
92
Superman is flying at an altitude of 200 meters from the surface of the atlantic Ocean and
sees Aquaman sitting at his throne 275 meters from the surface of the ocean. How far is the
actual distance of Aquaman from the surface of the Ocean?
A. 230.65 m
B. 266.00 m
C. 285.25 m
D. 365.75 m
D
93
93. 21.Superman is flying at an altitude of 200 meters from the surface of the atlantic Ocean
and sees Aquaman sitting at his throne 275 meters from the surface of the ocean. How far is
Superman from the surface of the Ocean as seen by Aquaman?
A. 230.65 m
B. 266.00 m
C. 285.25 m
D. 365.75 m
B
94
Compute for the lateral displacement that happens to a ray of light as it strikes and passes
through a slab of polycarbonate plastic at an angle of 22 degrees if the polycarbonate is
suspended in air and it is 30 cm thick.
A. 4.45 cm
B. 9.75 cm
C. 13.25 cm
D. 1.35 cm
A
95
95. Compute for the critical angle in crown glass and water interface.
A. 40.63 degrees
B. 43.75 degrees
C. 60.84 degrees
D. 78.69 degrees
C
96
Compute for the angle of refraction of a monochromatic light incident to a CR 39 lens at an
angle of 76 degrees assuming that the lens is suspended in air.
A. 40.63 degrees
B. 43.75 degrees
C. 60.84 degrees
D. 78.69 degrees
A
97
97. What will happen to a monochromatic light as it enters a diamond at an angle of 35 degrees
assuming that the diamond is suspended in air?
A. B. C. It will be reflected internally
It will be refracted toward the normal ray
It will be refracted away from the normal ray
D. It will be absorbed by the diamond
A
98
A single ray of light is incident to a crown glass at an angle of 27 degrees. If the light is
coming from water, what will happen to the ray of light?
A. It will be reflected internally
B. It will be refracted toward the normal ray
C. It will be refracted away from the normal ray
D. It will be absorbed by the diamond
B
99
====
100
100. A tree 3 meters high is positioned 2 meters away from a concave lens with a focal length of
1 meter. Find the position of the image.
A. -0.67 m
B. -1.5 m
C. 1.5 m
D. 2 m
A
101
An object 50 cm in size is placed in a certain position facing a lens and the image of the
object is real, inverted and half the size of the object. If the image is located 30 cm away from
the lens find the focal length of the lens.
A. 5 cm
B. 10 cmc.
C. 20 cm
D. 30 cm
C
102
102. An object 50 cm in size is placed in a certain position facing a lens and the image of the
object is real, inverted and half the size of the object. If the image is located 30 cm away from
the lens what is the type the spherical lens?
A. Convex lens
B. Concave lens
C. Can be both convex or concave lens
D. Neither convex nor concave
A
103
An object is placed 20 cm in front of a converging lens with the power of +5.00 D. What is
the characteristics of the image formed?
A. Real, inverted and magnified
B. Real, inverted and same size as the object
C. Real, inverted and minified
D. No image is formed
D
104
104. A tree 6 meters high is positioned 3 meters away from a concave lens with a focal length of
1 meter. What is the nature of the image formed?
A. Virtual, erect minified
B. Virtual, erect, magnified
C. Virtual, inverted, minified
D. Virtual, inverted, magnified
A
105
Patricia who is 5 feet 3 inches tall is standing 50 inches in front of a concave lens which
has a focal length of 2.5 feet. Compute for the magnification.
A. 0.30 x
B. 0.38x
C. 0.79 x
D. 1.26 x
B
106
An arrow 1.6 meter high is placed 200 cm from a point source of light. If a screen is placed
325 cm away from the arrow, how tall will be the shadow of the arrow formed on the screen in
meters
A. 4.2 meters
B. 3.7 meters
C. 7.6 meters
D. 3.1 meters
A
107
107. What is the apparent angular elevation of the sun when a telegraph pole 30 feet high casts
a shadow 45 ft. long on a horizontal pavement?
A. 63 degrees
B. 59 degrees
C. 49 degrees
D. 36 degrees
D
108
An object 25 mm in size is placed in a finite position between a light source and a screen. If
the object is positioned 10 cm from the light source and the screen is positioned 2 meters away
from the light source, what is the size of the object's shadow formed of the screen in (cm)?
A. 50 cm
B. 60 cm
C. 70 cm
D. 40 cm
A
109
A pencil 15 cm long is placed 1300 mm away from the source. If the shadow formed on the
screen is 1800 mm long, how far is the screen from the light source in cm?
A. 1560 cm
B. 876 cm
C. 437 cm
D. 132 cm
AA
110
110. Velocity of light in air
A. 186,000 km/sec
B. 300,000 miles/ sec
C. 300,000 miles/ min
D. 186,000 miles/ sec
D
111
—-
112
A focal length of a + 3.00 diopter lens is?
A. .33 m
B. .33 cm
C. 3.3 m
D. .33 mm
A
113
113. A converging lens has a focal length of 2 meters. The power of this lens is?
A. +0.50 diopters
B. - 0.50 diopters
C. +2.00 diopters
D. - 2.00 diopters
A
114
114. A screen is positioned 100 m away from a point source of light. An object positioned 20
meters away from the light source produced a shadow which is 70 m tall. How tall is the object?
A. 14 meters
B. 11 meters
A
115
It is a collection of convergent, divergent and parallel rays of light coming from an extended
light source
A. vergence of light
B. rays of light
C. beam of light
D. pencil of light
C
116
116. Index of refraction of Light flint glass
A. 1.923
B. 1.58
C. 1.33
D. 1.49
B
117
A transparent refracting medium consisting of two flat planes converging surfaces which
meet in a line called APEX and whose divergent extremities are connected by a surface called
the BASE
A. Prism
B. Diamond
C. Mirror
D. Lens
A
118
118. Part of prism where the two plane surfaces meet.
A. Refracting Surface
B. Base
C. Apex
D. Principal Section
C
119
Rate of flow of luminous energy from a source.
A. Luminous Intensity
B. Luminous Flux
C. Illumination
D. Illuminance
B
120
120. It is used for measuring and comparing light quantities.
A. Photometer
B. Phoropter
C. Lens
D. Lensometer
A
121
What is the unit of vergence?
A. Diopter
B. Hertz
C. Kilohertz
D. Meters
A
122
122. What is the correcting prism if the patient has Esotropia over the left eye with 20/60 visual
A. Prism Base In
acuity?
B. Prism Base Out
C. Prism Base Up
D. Prism Base Down
B
123
What is the prism direction if the patient has Exotropia over the right non seeing eye?
A. Prism Base In
B. Prism Base Out
C. Prism Base Up
D. Prism Base Down
B
124
5 degrees are equivalent to how many prism diopter?
A. 10 prism diopter
B. 8.75 prism diopter
C. 9 prism diopter
D. 1 prism diopter
B
125
125. Find the illuminance of the table 4 m directly under a 100 cd electric lamp.
A. 100 mc
B. 4 lumen
C. 6.25 mc
D. 6.25 steradians
C
126
What illuminance will be given on a desk by a 36-cd fluorescent lamp 1 foot long placed 18
inches above the surface?
A. 6 fc
B. 48 fc
C. 0.75 steradians
D. 32 cd
B
127
127. It says that a prism which will deviate a ray of light is 100 part of the arc of a radian.
A. Prentice rule
B. Properties of prism
C. Dennet’s Method
D. Law of Illumination
C
128
—
129
Find the illuminance of the table 4 m directly under a 100 cd electric lamp.
A. 100 mc
B. 4 lumen
C. 6.25 mc
D. 6.25 steradians
C
130
130. It states that the candle powers of two light sources are directly proportioned to the
squares of their distances from the screen of a photometer.
A. Inverse Square Law
B. Law of Intensity
C. Law of Rectilinear Propagation of Light
D. Law of Reflection
B
131
An unknown lamp placed 6m from a photometer screen provides the same illumination as
an 80-cd lamp placed 4m from that same screen. What is the candle power of the unknown
lamp?
A. 120 cd
B. 53.33 cd
C. 80 cd
D. 480 cd
A
132
—-
133
—
134
+5.50 sph = -0.50 c x 90 to sph cyl
A. +6.00sph = -0.50 cx 180
B. +5.00 sph = +0.50 cx 180
C. -5.50 sph = +0.50 cx 180
D. +5.50 sph = -6.00 cx 90
B
135
-2.25s = -2.25c x 150 to cross cyl
A. -2.25 cx 60 = +4.50 cx 150
B. -2.25 cx 60 = -2.50 cx 150
C. -2.25 cx 60 = -4.50 cx 150
D. +2.25 cx 60 = -4.50 cx 150
C
136
Both surfaces having same curve but of different power
A. Plano convex/ Plano concave
B. Bi-convex/ Bi-concave
C. Equi- convex/ Equi- concave
D. Plus/ minus meniscus
B
137
137. Consist of two straight lines drawn at right angles to each other and representing the
principal meridians of a lens or lens combinations.
A. Optical Cross
B. Power Meridian
C. Axis Meridian
D. Neutralization
A
138
A glass meniscus lens with an index of refraction of 1.58 has a concave surface of radius
–55 cm and a convex surface whose radius is +45 cm. What is the focal length of the lens.
A. 434.78 cm
B. 40 cm
C. 2.50 D
D. 0.25 D
A
139
139. A concave surface has a radius of 55 inches. What is its power if n = 2.417?
A. +1.00 D
B. -1.00 D
C. 40 inches
D. 1 inches
B
140
Find the single prism equivalent to a 2Δ BI combined with a 5Δ BU in front of the left eye.
A. 5.4 Δ BU & I @ 112°
B. 5.4 Δ BU & I @ 68°
C. 5.4 Δ BU & I @ 248°
D. 5.4 Δ BU & I @ 292°
A
141
141. Find the single prism equivalent to a 3Δ BI combined with a 4Δ BD in front of the left eye.
A. 5 Δ BI & D @ 63°
B. 5 Δ BI & D @ 243°
C. 5 Δ BI & D @ 117°
D. 5 Δ BI & D @ 297°
B
142
Find the single prism equivalent to a 3.5Δ BI combined with a 3.5Δ BU in front of the right
eye.
A. 4.95 Δ BI & U @ 45°
B. 4.95 Δ BI & U @ 135°
C. 4.95 Δ BI & U @ 225°
D. 4.95 Δ BI & U @ 315°
A
143
—-
144
===
145
A prescription calls for +5.00DS with a 2Δ base out prism. What decentration is required to
achieve this?
A. 4mm Out
B. 4mm In
C. 4cm Out
D. 4cm In
A
146
Answer the question base on the problem. What is the induced prismatic effect when
+5.00s = -3.00cx90 is decentered 5mm in and 3mm up? (Question 1 : What is prism induced
due to sphere in horizontal meridian?)
A. 2.5 Δ BI
B. 2.5 Δ BO
C. 25 Δ BO
D. 25 Δ BI
A
147
Answer the question base on the problem. What is the induced prismatic effect when
+5.00s = -3.00cx90 is decentered 5mm in and 3mm up? (Question 1 : What is prism induced
due to sphere in vertical meridian?)
A. 1.5 Δ BD
B. 1.5 Δ BU
C. 15 Δ BU
D. 15 Δ BD
B
148
Answer the question base on the problem. What is the induced prismatic effect when
+5.00s = -3.00cx90 is decentered 5mm in and 3mm up? (Question 1 : What is prism induced
due to cylinder in h0rizontal meridian?)
A. 15 Δ BO
B. 15 Δ BI
C. 1.5 Δ BO
C
149
149. Answer the question base on the problem. What is the induced prismatic effect when
+5.00s = -3.00cx90 is decentered 5mm in and 3mm up? (Question 1 : What is the overall
prismatic effect in Horizontal Meridian?)
A. 1 Δ BO
B. 1 Δ BI
C. 4 Δ BO
D. 4 Δ BI
B
150
Answer the question base on the problem. What is the induced prismatic effect when
+5.00s = -3.00cx90 is decentered 5mm in and 3mm up? (Question 1 : What is the overall
prismatic effect in Vertical Meridian?)
A. 10.5 Δ BU
B. 1.5 Δ BU
C. 10.5 Δ BD
D. 1.5 Δ BD
B
