ABO PRACTICAL EXAM(VERRIFIED )

ABO PRACTICAL EXAM(VERRIFIED ) Cancelling effect- subtract prism amounts - CORRECT ANSWER-BU/BU BD/BD BI/BO Powers between 0.00 & +/- 3.00 - CORRECT ANSWER-Read in 1/8 diopters .12 .37 .62 .87 Lensometer is also referred to as - CORRECT ANSWER-Lensmeter, focimeter, vertometer To focus eyepiece - CORRECT ANSWER-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 - CORRECT ANSWER-Axis must be @ 180°, if not, transpose rx. P=hcmxd - CORRECT ANSWER-Prentice rule P(prism) Hcm(amount moved) D(diopter) BO/BO - CORRECT ANSWER-Compounds- add BI/BI - CORRECT ANSWER-Compounds- add BU/BD - CORRECT ANSWER-Compounds- add BU/BU - CORRECT ANSWER-Cancels- subtract BD/BD - CORRECT ANSWER-Cancels- subtract BI/BO - CORRECT ANSWER-Cancels- subtract Black numbers on lensometer power drum - CORRECT ANSWER-(+)