ABO PRACTICAL EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST ALREADY GRADED A+ 2026
When should you use occluder?
For noticeable eye abnormalities. Ex.: Strabismus.
Also to check binocular PD by occluding each eye to see if eye
moved when occluded.
How to check for vertical imbalance
1) mark OD, OC by centering within retical
2) without moving the lens table, move to OS lens
3) if not still centered, there is imbalance.
What type of Lens design has vertical imbalance as part of its
design?
Progressive lenses
Measure cylinder value of the lens by: bringing far lines into focus,
THEN:
Subtract current measurement on power drum from spherical
reading.
PD for Single vision & progressive
Monocular
, PD for bifocals and trifocals
Binocular
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.
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST ALREADY GRADED A+ 2026
When should you use occluder?
For noticeable eye abnormalities. Ex.: Strabismus.
Also to check binocular PD by occluding each eye to see if eye
moved when occluded.
How to check for vertical imbalance
1) mark OD, OC by centering within retical
2) without moving the lens table, move to OS lens
3) if not still centered, there is imbalance.
What type of Lens design has vertical imbalance as part of its
design?
Progressive lenses
Measure cylinder value of the lens by: bringing far lines into focus,
THEN:
Subtract current measurement on power drum from spherical
reading.
PD for Single vision & progressive
Monocular
, PD for bifocals and trifocals
Binocular
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.
