ABO Practical Exam with Verified Solutions
1. Cancelling effect- BU/BU
subtract prism BD/BD
amounts BI/BO
2. Powers between Read in 1/8 diopters
0.00 & +/- 3.00 .12
.37
.62
.87
3. Lensometer is also Lensmeter, focimeter, vertometer
referred to as
4. 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.
5. To read HORIZON- Axis must be @ 180°, if not, transpose rx.
TAL prism
6. P=hcmxd Prentice rule
P(prism)
Hcm(amount moved)
D(diopter)
7. BO/BO Compounds- add
8. BI/BI Compounds- add
9. BU/BD Compounds- add
10. BU/BU Cancels- subtract
11. BD/BD Cancels- subtract
12. BI/BO Cancels- subtract
1/4
1. Cancelling effect- BU/BU
subtract prism BD/BD
amounts BI/BO
2. Powers between Read in 1/8 diopters
0.00 & +/- 3.00 .12
.37
.62
.87
3. Lensometer is also Lensmeter, focimeter, vertometer
referred to as
4. 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.
5. To read HORIZON- Axis must be @ 180°, if not, transpose rx.
TAL prism
6. P=hcmxd Prentice rule
P(prism)
Hcm(amount moved)
D(diopter)
7. BO/BO Compounds- add
8. BI/BI Compounds- add
9. BU/BD Compounds- add
10. BU/BU Cancels- subtract
11. BD/BD Cancels- subtract
12. BI/BO Cancels- subtract
1/4
