ABO Advance Questions Solved 100% Correct
The amount of reflection of each surface of cr-39 lenses is approximately?
A. 2%
B. 4%
C. 6%
D. 8% - ✔✔4%
The absorption of light in lenses is classified by two variables. What are they?
A. Base curve and thickness
B. Index of refraction and thickness
C. Thickness and lens transmission
D. Tint, and lens transmission - ✔✔C. Thickness and len transmission
The denser the tint in a lens____
A. The greater transmission of light through the lens
B. The greater internal reflections in the lens
C. The less transmission of light through the lens
D. The fewer internal reflections in the lens - ✔✔C the less transmission of light through the
lens
The standard transmissions in sun lenses should range between?
A. 10% and 30%
B. 15% and 30%
C. 10% and 25%
D. 15% and 25% - ✔✔B. 15 and 30%
If a person has exposure to sunlight at least 2 hrs or more during the day,
,A. Their tolerance of bright sunlight is increased
B. Their tolerance of bright sunlight is decreased
C. Their ability to adapt to quick lighting changes is increased
D. Their ability to adapt to night vision is compromised if they don't protect their eyes from sun
exposure. - ✔✔D.
A characteristic of a dark tinted glass lens with an RX of +4.00 sphere would be?
A. Uniform density in color
B. Dark on the edge and lighter in the center
C. Dark in the center and lighter on the edge
D. Waves in the tint - ✔✔C. Dark in the center and lighter on the edge
Given a high plus or high minus rx, which lens material would offer the best choice for uniform
density in a sun lens
A. Pigmented glass
B. Cr-39
C trivex
D b&c - ✔✔D. B&C
Although this may be the most popular color for sun lenses it is not recommended for patients
with emerging cataracts - ✔✔Grey
_______ added to any color increases contrast - ✔✔Yellow
______ is better than ____ for improving contrast
A. Violet/gray
B. Green/gray
C. Gray/green
,D. Gray/ violet - ✔✔B. Green/gray
Glare is of more concern to which wearer?
A. Red haired patient
B. Computer user
C. Cataract patient
D. Presbyope - ✔✔C. Cataract patient
________ are generally inorganic materials (metals or minerals) that are vacuum deposited to
add color on glass lenses to give a uniform density of color on the lenses
A.vacuum color coatings
B. Deposit color coatings
C. Heavy color coatings
D. AR color coatings - ✔✔A vacuum color coatings
What company introduced CR-39 lenses - ✔✔PPG Industries
Abduction - ✔✔Eye moves temporally
Adduction - ✔✔Eye moves nasally
Depression - ✔✔Eye moves down
Intorsion - ✔✔top of cornea rotates towards nose
Extorsion - ✔✔top of cornea rotates away from the nose
, convergence - ✔✔Both eyes move nasally at the same time
Divergence - ✔✔Both eyes move temporally at the same time
What is better to correct refractive aniseikonia and why?
A. Glasses
B. Contact lenses - ✔✔Contact lenses because they reduce the vertex distance to 0- thus
eliminating the magnification/minification difference
What is better to correct axial aniseikonia?
A.glasses
B. Contact lenses - ✔✔Glasses
spectacle magnification formula - ✔✔1/1-(T/NxF) x 1/1-(h xD)
D= diopter power
F= front base curve
T= center thickness in meters
N= index of refraction of lens material
h= vertex distance in meters plus 3mm to vertex to the pupil
Prentice Rule Formula - ✔✔Prism= h x D/10
H= distance moved in mm
D= total diopter power for the meridian
Symptoms of excessive base down prism - ✔✔Floor or horizontal surfaces seem concave
Standing in the bottom of a bowl
Vertical objects seem taller
The amount of reflection of each surface of cr-39 lenses is approximately?
A. 2%
B. 4%
C. 6%
D. 8% - ✔✔4%
The absorption of light in lenses is classified by two variables. What are they?
A. Base curve and thickness
B. Index of refraction and thickness
C. Thickness and lens transmission
D. Tint, and lens transmission - ✔✔C. Thickness and len transmission
The denser the tint in a lens____
A. The greater transmission of light through the lens
B. The greater internal reflections in the lens
C. The less transmission of light through the lens
D. The fewer internal reflections in the lens - ✔✔C the less transmission of light through the
lens
The standard transmissions in sun lenses should range between?
A. 10% and 30%
B. 15% and 30%
C. 10% and 25%
D. 15% and 25% - ✔✔B. 15 and 30%
If a person has exposure to sunlight at least 2 hrs or more during the day,
,A. Their tolerance of bright sunlight is increased
B. Their tolerance of bright sunlight is decreased
C. Their ability to adapt to quick lighting changes is increased
D. Their ability to adapt to night vision is compromised if they don't protect their eyes from sun
exposure. - ✔✔D.
A characteristic of a dark tinted glass lens with an RX of +4.00 sphere would be?
A. Uniform density in color
B. Dark on the edge and lighter in the center
C. Dark in the center and lighter on the edge
D. Waves in the tint - ✔✔C. Dark in the center and lighter on the edge
Given a high plus or high minus rx, which lens material would offer the best choice for uniform
density in a sun lens
A. Pigmented glass
B. Cr-39
C trivex
D b&c - ✔✔D. B&C
Although this may be the most popular color for sun lenses it is not recommended for patients
with emerging cataracts - ✔✔Grey
_______ added to any color increases contrast - ✔✔Yellow
______ is better than ____ for improving contrast
A. Violet/gray
B. Green/gray
C. Gray/green
,D. Gray/ violet - ✔✔B. Green/gray
Glare is of more concern to which wearer?
A. Red haired patient
B. Computer user
C. Cataract patient
D. Presbyope - ✔✔C. Cataract patient
________ are generally inorganic materials (metals or minerals) that are vacuum deposited to
add color on glass lenses to give a uniform density of color on the lenses
A.vacuum color coatings
B. Deposit color coatings
C. Heavy color coatings
D. AR color coatings - ✔✔A vacuum color coatings
What company introduced CR-39 lenses - ✔✔PPG Industries
Abduction - ✔✔Eye moves temporally
Adduction - ✔✔Eye moves nasally
Depression - ✔✔Eye moves down
Intorsion - ✔✔top of cornea rotates towards nose
Extorsion - ✔✔top of cornea rotates away from the nose
, convergence - ✔✔Both eyes move nasally at the same time
Divergence - ✔✔Both eyes move temporally at the same time
What is better to correct refractive aniseikonia and why?
A. Glasses
B. Contact lenses - ✔✔Contact lenses because they reduce the vertex distance to 0- thus
eliminating the magnification/minification difference
What is better to correct axial aniseikonia?
A.glasses
B. Contact lenses - ✔✔Glasses
spectacle magnification formula - ✔✔1/1-(T/NxF) x 1/1-(h xD)
D= diopter power
F= front base curve
T= center thickness in meters
N= index of refraction of lens material
h= vertex distance in meters plus 3mm to vertex to the pupil
Prentice Rule Formula - ✔✔Prism= h x D/10
H= distance moved in mm
D= total diopter power for the meridian
Symptoms of excessive base down prism - ✔✔Floor or horizontal surfaces seem concave
Standing in the bottom of a bowl
Vertical objects seem taller
