ABO Practical Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
1. Single Vision corrects for one distance
2. Multifocal Corrects with two or more prescriptions (or 'powers')
3. Bifocal lens having two focus strengths
4. Trifocal pertaining to having three focus strengths
5. Calculating obtained at the center of an optical lens by producing a ditterence in
Pris-matic
edge thickness, either by grinding the back surface at an angle to the
Effects
front surface during lens surfacing or, if the lens has suflcient power, de-
centering the optical center of the lens
BI &
6. Compoundi
BI BO
ng Prism
& BO
BU &
BD
7. Cancelling Prism BI & BO
BD & BD
BU & BU
8. Prentice's Rule P=hcm x D
P=amount of prism
created h= number of
cm OC moved
cm= centimeters (convert to mm, divide by
10) D= power in meridian with error
9. Vertical by lens
Imbal-ance
10. OC Height's
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, ABO Practical Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
The ditterence in vertical s FT = 5mm above
prism power at the segment
reading level in a pair of
lenses.
SV = 1/2 of B
P
r
o
g
r
e
s
s
i
v
e
=
F
i
t
t
i
n
g
c
r
o
s
2/
19
, ABO Practical Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
11. Vertex A plus lens when moved farther from the eye gains in plus
Compen- power Distance is 0 with CL because they are on the eye
sation
De= Dl/(1 + d xDl)
12. Vertex
De= diopter ettective value of error
compen-
created D/= lens power (given power)
sation
d= amount in METERS lens moved from refracted position to position
Formula
lens is worn Keep sign for what it is (+/-)
- to d means moves
away PD
13. Horizontal
OC
Cen-tration
14. Vertical
Centra-tion Given PD/OC - Human PD/OC= mm
moved Frame PD is found by adding
15. Horizontal & A+DBL
Ver-tical
Centration
Formula Dt= (sina)²x Dc +Ds
Dt= Total Power we need
16. Power in (sina)²= degree we have degree we
Oblique need Dc= cylinder power
Meridians Ds= sphere power
17. Lensmeter is an ophthalmic instrument. It is mainly used by optometrists and
opticians to verify the correct prescription in a pair of eyeglasses, to
properly orient and mark uncut lenses, and to confirm the correct
mounting of lenses in spectacle frames. (also known as a focimeter or
vertometer)
18. Lens Measure-ment Devices
3/
19
Answers |Actual Complete Update |Already Graded A+
1. Single Vision corrects for one distance
2. Multifocal Corrects with two or more prescriptions (or 'powers')
3. Bifocal lens having two focus strengths
4. Trifocal pertaining to having three focus strengths
5. Calculating obtained at the center of an optical lens by producing a ditterence in
Pris-matic
edge thickness, either by grinding the back surface at an angle to the
Effects
front surface during lens surfacing or, if the lens has suflcient power, de-
centering the optical center of the lens
BI &
6. Compoundi
BI BO
ng Prism
& BO
BU &
BD
7. Cancelling Prism BI & BO
BD & BD
BU & BU
8. Prentice's Rule P=hcm x D
P=amount of prism
created h= number of
cm OC moved
cm= centimeters (convert to mm, divide by
10) D= power in meridian with error
9. Vertical by lens
Imbal-ance
10. OC Height's
1/
19
, ABO Practical Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
The ditterence in vertical s FT = 5mm above
prism power at the segment
reading level in a pair of
lenses.
SV = 1/2 of B
P
r
o
g
r
e
s
s
i
v
e
=
F
i
t
t
i
n
g
c
r
o
s
2/
19
, ABO Practical Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
11. Vertex A plus lens when moved farther from the eye gains in plus
Compen- power Distance is 0 with CL because they are on the eye
sation
De= Dl/(1 + d xDl)
12. Vertex
De= diopter ettective value of error
compen-
created D/= lens power (given power)
sation
d= amount in METERS lens moved from refracted position to position
Formula
lens is worn Keep sign for what it is (+/-)
- to d means moves
away PD
13. Horizontal
OC
Cen-tration
14. Vertical
Centra-tion Given PD/OC - Human PD/OC= mm
moved Frame PD is found by adding
15. Horizontal & A+DBL
Ver-tical
Centration
Formula Dt= (sina)²x Dc +Ds
Dt= Total Power we need
16. Power in (sina)²= degree we have degree we
Oblique need Dc= cylinder power
Meridians Ds= sphere power
17. Lensmeter is an ophthalmic instrument. It is mainly used by optometrists and
opticians to verify the correct prescription in a pair of eyeglasses, to
properly orient and mark uncut lenses, and to confirm the correct
mounting of lenses in spectacle frames. (also known as a focimeter or
vertometer)
18. Lens Measure-ment Devices
3/
19
