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ABO Practical Exam QUESTIONS AND ANSWERS LATEST UPDATED 2024.
Typology: Exams
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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 . . . . 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 (+) Red numbers on lensometer power drum - Correct answer (-) When neutralizing, if you have a power that is in 1/8 diopters and need to subtract - Correct answer Add 1 to 1/8 amount Ex. .12, you would need to subtract. Focus sphere lines first, if cylinder lines focus first - Correct answer Rotate axis drum by 90° When you have cylinder power, turn the power drum to - Correct answer The high plus, then gradually reduce power until one of the meridians comes into focus. Where is the prism reference point (PRP) on progressives? - Correct answer centered directly between the two horizontal alignment engravings (or ink markings), usually about 2 to 4 mm below the fitting cross of the lens. Where is the distance reference point (DRP) located on progressive lenses? - Correct answer generally located approximately 4 mm above the Fitting Point, providing an area completely free of the progressive power gradient. Near reference point (NRP) - Correct answer represents the location on the surface that provides the full target Add power, which is the optimal location for verifying the Add power of the prescription. It is located at the center of the near checking circle ink marking. Major Reference Point: (MRP) - Correct answer The point on a lens where the patient is provided the prescription as written by the doctor. If prism is not called for in the prescription then the lens OC and the MRP are the same. Add power is - Correct answer The difference between the sphere and power in reading area of lens. *subtract full reading amount from sph. value Cylinder power is always used to determine if axis - Correct answer Meets ANSI standards Binocular PD - Correct answer Total PD of both eyes together. From one pupil to the other pupil. Monocular PD - Correct answer Individual PD of each eye. From pupil to bridge.