ABO Practical Exam 2023 with 100% correct answers
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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