ABO Practical Exam Questions and Answers 100% Correct

Cancelling effect- subtract prism amountsBU/BU BD/BD BI/BO Powers between 0.00 & +/- 3.00Read in 1/8 diopters .12 .37 .62 .87 Lensometer is also referred to asLensmeter, focimeter, vertometer To focus eyepiece1) 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 prismAxis must be @ 180°, if not, transpose rx. P=hcmxdPrentice rule P(prism) Hcm(amount moved) D(diopter) BO/BOCompounds- add BI/BICompounds- add BU/BDCompounds- add BU/BUCancels- subtract BD/BDCancels- subtract BI/BOCancels- subtract Black numbers on lensometer power drum(+