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ABO PRACTICAL EXAM WITH 100.

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Exam (elaborations)

ABO PRACTICAL EXAM WITH 100.

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ABO PRACTICAL EXAM WITH 100%
CORRECT ANSWERS

SingledVisiond-dcorrectdanswer-correctsdfordoneddistance

Multifocald-dcorrectdanswer-Correctsdwithdtwodordmoredprescriptionsd(ord'powers')

Bifocald-dcorrectdanswer-lensdhavingdtwodfocusdstrengths

Trifocald-dcorrectdanswer-pertainingdtodhavingdthreedfocusdstrengths

CalculatingdPrismaticdEffectsd-dcorrectdanswer-
obtaineddatdthedcenterdofdandopticaldlensdbydproducingdaddifferencedindedgedthickne
ss,deitherdbydgrindingdthedbackdsurfacedatdandangledtodthedfrontdsurfacedduringdlens
dsurfacingdor,difdthedlensdhasdsufficientdpower,dde-
centeringdthedopticaldcenterdofdthedlens

CompoundingdPrismd-dcorrectdanswer-BId&dBI
BOd&dBO
BUd&dBD

CancellingdPrismd-dcorrectdanswer-BId&dBO
BDd&dBD
BUd&dBU

Prentice'sdRuled-dcorrectdanswer-P=hcmdxdD
P=amountdofdprismdcreated
h=dnumberdofdcmdOCdmoved
cm=dcentimetersd(convertdtodmm,ddividedbyd10)
D=dpowerdindmeridiandwithderror

VerticaldImbalanced-dcorrectdanswer-
Theddifferencedindverticaldprismdpowerdatdthedreadingdleveldindadpairdofdlenses.

OCdHeight'sdbydlensd-dcorrectdanswer-SVd=d1/2dofdB

, Progressived=dFittingdcross
FTd=d5mmdabovedsegment

VertexdCompensationd-dcorrectdanswer-
Adplusdlensdwhendmoveddfartherdfromdthedeyedgainsdindplusdpower
Distancedisd0dwithdCLdbecausedtheydaredondthedeye

VertexdcompensationdFormulad-dcorrectdanswer-De=dDl/(1d+dddxDl)
De=ddiopterdeffectivedvaluedofderrordcreated
D/=dlensdpowerd(givendpower)
d=damountdindMETERSdlensdmoveddfromdrefracteddpositiondtodpositiondlensdisdworn
Keepdsigndfordwhatditdisd(+/-)
-dtodddmeansdmovesdaway

HorizontaldCentrationd-dcorrectdanswer-PD

VerticaldCentrationd-dcorrectdanswer-OC

Horizontald&dVerticaldCentrationdFormulad-dcorrectdanswer-GivendPD/OCd-
dHumandPD/OC=dmmdmoved
FramedPDdisdfounddbydaddingdA+DBL

PowerdindObliquedMeridiansd-dcorrectdanswer-Dt=d(sina)²xdDcd+Ds
Dt=dTotaldPowerdwedneed
(sina)²=ddegreedwedhaveddegreedwedneed
Dc=dcylinderdpower
Ds=dspheredpower

Lensmeterd-dcorrectdanswer-
isdandophthalmicdinstrument.dItdisdmainlyduseddbydoptometristsdanddopticiansdtodveri
fydthedcorrectdprescriptiondindadpairdofdeyeglasses,dtodproperlydorientdanddmarkdunc
utdlenses,danddtodconfirmdthedcorrectdmountingdofdlensesdindspectacledframes.d(also
dknowndasdadfocimeterdordvertometer)

LensdMeasurementdDevicesd-dcorrectdanswer-
lensdclock,dcalipers,dmillimeterdruler,dcircumferencedgauge

LensdClockd-dcorrectdanswer-
isduseddtodmeasuredthedsurfacedpowersdbasedcurvedofdadlens

LensdCalipersd-dcorrectdanswer-Measuresdthicknessdofdlensesdindmm

Millimeterdrulerd-dcorrectdanswer-
measuresdinterpupillaryddistance,dordsegdheights,dordOCdheights

Circumferencedgauged-dcorrectdanswer-
Fordquickdanddaccuratedmeasurementsdofdlensesdordpatterns.

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Uploaded on: August 27, 2024
Number of pages: 7
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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