ABO PRACTICAL EXAM(VERRIFIED )

Take monocular PD fABO 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-(+) 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 .13 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 ANSWERcentered 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. Optical Infinity - CORRECT ANSWER-used to measure distance PD-is a distance of about twenty feet. Pupillometer set @ 40cm - CORRECT ANSWER-Used to measure near PD. About 16 inches Pupillomters set @ 65cm - CORRECT ANSWER-Used to measure intermediate PD. About 25.5 inches Take binocular PD for - CORRECT ANSWER-Bifocal Rx- measure for distance and near Critical Rx- which also includes intermediate Take monocular PD for - CORRECT ANSWER-Progressive lens- distance Single vision- near Single vision- distance Single vision- intermediate When should you use occluder? - CORRECT ANSWER-For noticeable eye abnormalities. Ex.: Strabismus. Also to check binocular PD by occluding each eye to see if eye moved when occluded. How to check for vertical imbalance - CORRECT ANSWER-1) mark OD, OC by centering within retical 2) without moving the lens table, move to OS lens 3) if not still centered, there is imbalance. What type of Lens design has vertical imbalance as part of its design? - CORRECT ANSWER-Progressive lenses Measure cylinder value of the lens by: bringing far lines into focus, THEN: - CORRECT ANSWER-Subtract current measurement on power drum from spherical reading. PD for Single vision & progressive - CORRECT ANSWER-Mor