ABO PRACTICAL TEST LATEST WITH CORRECT ANSWERS 2023/2024

ABO PRACTICAL TEST LATEST WITH CORRECT ANSWERS 2023/2024 Single Vision - CORRECT ANSWER-corrects for one distance Multifocal - CORRECT ANSWER-Corrects with two or more prescriptions (or 'powers') Bifocal - CORRECT ANSWER-lens having two focus strengths Trifocal - CORRECT ANSWER-pertaining to having three focus strengths Calculating Prismatic Effects - CORRECT ANSWER-obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if the lens has sufficient power, de-centering the optical center of the lens Compounding Prism - CORRECT ANSWER-BI & BI BO & BO BU & BD Cancelling Prism - CORRECT ANSWER-BI & BO BD & BD BU & BU Prentice's Rule - CORRECT ANSWER-P=hcm x D P=amount of prism created h= number of cm OC moved cm= centimeters (convert to mm, divide by 10) D= power in meridian with error Vertical Imbalance - CORRECT ANSWER-The difference in vertical prism power at the reading level in a pair of lenses. OC Height's by lens - CORRECT ANSWER-SV = 1/2 of B Progressive = Fitting cross FT = 5mm above segment Vertex Compensation - CORRECT ANSWER-A plus lens when moved farther from the eye gains in plus power Distance is 0 with CL because they are on the eye Vertex compensation Formula - CORRECT ANSWER-De= Dl/(1 + d xDl) De= diopter effective value of error created D/= lens power (given power) d= amount in METERS lens moved from refracted position to position lens is worn Keep sign for what it is (+/-) - to d means moves away Horizontal Centration - CORRECT ANSWER-PD Vertical Centration - CORRECT ANSWER-OC Horizontal & Vertical Centration Formula - CORRECT ANSWER-Given PD/OC - Human PD/OC= mm moved Frame PD is found by adding A+DBL Power in Oblique Meridians - CORRECT ANSWER-Dt= (sina)²x Dc +Ds Dt= Total Power we need (sina)²= degree we have degree we need Dc= cylinder power Ds= sphere power Lensmeter - CORRECT ANSWER-is an ophthalmic instrument. It is mainly used by optometrists and opticians to verify the correct prescription in a pair of eyeglasses, to properly orient and mark uncut lenses, and to confirm the correct mounting of lenses in spectacle frames. (also known as a focimeter or vertometer) Lens Measurement Devices - CORRECT ANSWER-lens clock, calipers, millimeter ruler, circumference gauge Lens Clock - CORRECT ANSWER-is used to measure the surface powers base curve of a lens Lens Calipers - CORRECT ANSWER-Measures thickness of lenses in mm Millimeter ruler - CORRECT ANSWER-measures interpupillary distance, or seg heights, or OC heights Circumference gauge - CORRECT ANSWER-For quick and accurate measurements of lenses or patterns. Corneal reflex Pupilometer - CORRECT ANSWER-for precisely measuring and digitally recording pupillary distances. Used for measuring of monocular and binocular Hand Tools - CORRECT ANSWER-Screwdrivers, needle-nose pliers, tweezers, files scratchless screwdriver - CORRECT ANSWER-for working on drill mount or facetted lenses pickup screwdriver - CORRECT ANSWER-jaws with spring tension to hold screws while you put them in place, available with either type blade Big Brass screwdriver - CORRECT ANSWER-unscrew most screw, with a large brass handle plastic top screwdriver - CORRECT ANSWER-most popular and most dangerous Pad Popper - CORRECT ANSWER-used to remove snap-in nosepads without changing the alignment of the adjustable guard arms. the prongs are inserted behind the nosepad and in front of the nosepad box. a simple twist removes the pad Rimless mounting tool - CORRECT ANSWER-the hook is started at the hinge side of the nylon line that pulls around the lens. use caution, easy to chip lens eyewire sizing pliers - CORRECT ANSWER-used to check the size of the lens without damaging the barrels of the frame lens axis pliers - CORRECT ANSWER-allow you to turn the lens to adjust the axis while it is mounted in the frame Flat/round Nose Pliers - CORRECT ANSWER-used to change the curvature of pad arm loops. positioned so the loop is bent around the round tip Nylon Jaw flat/round nose pliers or Half-padded pliers - CORRECT ANSWER-they are used to protect the finish of metal frames during adjustments. nylon side should be positioned against the visible part of the frame Numont pliers - CORRECT ANSWER-used to hold eyewires of numont and nylon suspension frames during adjustment. you may also find them useful in adjusting the end pieces of narrow metal frames chappel cutting pliers - CORRECT ANSWER-he Chappel Cutting Plier cuts screw assemblies and reduces the risk of damaging lenses oblique cutting plier - CORRECT ANSWER-tips of these pliers taper to a 45 degree angle allowing you to get into small spaces B& L style adjusting pliers - CORRECT ANSWER-flat arm will work with pads whose mountings are flush against the pad European pad adjusting pliers - CORRECT ANSWER-designed specifically for screw and snap in type nosepad adjustment. box shaped indentation fits around the nosepad box. opposite jaw is curved to mimic the shape of the pad itself. curved arm is padded tp protect the pads when working with soft silicone pads temple angling pliers - CORRECT ANSWER-variety of jaw for adjusting the temples at hinge Nylon Eyewire forming pliers - CORRECT ANSWER-designed to form the eyewire of a metal frame to the curvature of the lens. can be used to curve the temple of the frame Nylon Jaw adjusting pliers - CORRECT ANSWER-especially good for adjusting metal frames and not marring the frame. great for two plier adjustments Tweezers - CORRECT ANSWER-great for working with tiny screws. useful for guiding nylon string (aka fishing line0 through small holes. available in different tip styles and grooves self-closing tweezers - CORRECT ANSWER-holds screws perpendicular to the tweezer body, works well on nose pad screws Zyl File - CORRECT ANSWER-Used to file plastic frames, good for rapid removal of material pillar file - CORRECT ANSWER-perfect for flat filing screw finishing or riffle file - CORRECT ANSWER-files screws without filing the frame slit file or screw head file - CORRECT ANSWER-for cleaning and restoring the screw head slots round or rat tail files - CORRECT ANSWER-for cleaning out or enlarging holes Screw extractors - CORRECT ANSWER-used in removing screws with stripped or broken heads. when using these come from the bottom of the hinge. there are sharp points that grip the broken screw to allow for removal Digital Measurement System - CORRECT ANSWER-takes measurements digitally for pd, seg height, and oc Orthoscopic Tilt - CORRECT ANSWER-ninety degree angle, resulting in no tilt retroscopic tilt - CORRECT ANSWER-bottoms of the eyewires sit out further from the face than the tops pf the eyewires pantoscopic tilt - CORRECT ANSWER-bottoms of the eyewires are in closer to the face than the tops of the eyewires splay angle - CORRECT ANSWER-nose pads are viewed from the top of the frame looking down, front edges of the pads are closer together than the back edges