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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution.
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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution. Cancelling effect- subtract prism amounts BU/BU BD/BD BI/BO Powers between 0.00 & +/- 3.00 Read in 1/8 diopters .12 .37 .62 .87 Lensometer is also referred to as Lensmeter, focimeter, vertometer To foc...

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  • January 11, 2024
  • 3
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • abo practical exam questions and correct answers

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  • ABO
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ABO Practical Exam Questions And Correct Answers,
With Complete Verified Solution.
Cancelling effect- subtract prism amounts
BU/BU
BD/BD
BI/BO
Powers between 0.00 & +/- 3.00
Read in 1/8 diopters
.12
.37
.62
.87
Lensometer is also referred to as
Lensmeter, focimeter, vertometer
To focus eyepiece
1) while turned off. Place white sheet of paper against lens stop.
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp.
3) remove paper and turn lensometer on
4) move power drum to high plus, then turn away from you until sharp- should land at
0.00.
To read HORIZONTAL prism
Axis must be @ 180°, if not, transpose rx.
P=hcmxd
Prentice rule
P(prism)
Hcm(amount moved)
D(diopter)
BO/BO
Compounds- add
BI/BI
Compounds- add
BU/BD
Compounds- add
BU/BU
Cancels- subtract
BD/BD
Cancels- subtract
BI/BO
Cancels- subtract
Black numbers on lensometer power drum
(+)
Red numbers on lensometer power drum
(-)

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