A-Scans and IOL Basics Quiz

You must correctly answer at least 24 of the 30 questions to receive AOA/CPC credit for this course.
Please use the name you wish to be printed on your certificate. You must list the email address used to purchase your course for attendance verification.
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wavelengthvelocityfrequencyamplitude
5 wavelengths per second1 wavelength per second2 wavelengths per second10 wavelengths per second
10 M Hz1 M Hz10 Hz100 Hz
TrueFalse
HertzMirroringEchoingReflectance
CorneaLens rectusRetinaScleraThey will all produce spikes
Non-contactIOLMasterContactNone of the above
Immersion A-ScanContact A-ScanIOLMasterAll of the above
LenstarContact A-ScanIOLMasterAll of the above
.1 diopter of hyperopia.25 diopters of myopia.1 diopter of myopia.25 diopters of hyperopia
AstigmatismMyopiaHyperopiaNone of the above
Cornea and retinaProbe and scleraProbe and retinaCornea and sclera
TrueFalse
180 degrees90 degrees75 degrees135 degrees
A poor scanThe probe is not lined up with the visual axisYou are hitting the optic nerve with the ultrasoundA good scan
TrueFalse
2.35 meters.0235 meters235 meters2350 meters
25.4 mm4.6 mm23.5 mm53.4 mm
A-Scan machinesA-Scan probesIOL formulasScleral shells
3% hydrogen peroxide soak for 10 minutesSoap and hot waterHot water rinse for 15 minutesDisinfection is not necessary
The cornea and lens peaksThe anterior lens peakThe retinal peakThe posterior lens and scleral peaks
SRK/T or Holladay IIBlinkhorst or HaigisHolladay or RegressionAll of them are equally useful for longer eyes
6548
Ossoinig shellsHanson shellsPrager shellsKohn shellsAll of the above
TrueFalse
2.45 mm3.24 mm3.55 mm2.95 mm
Never need to be measured; they already have an IOL implantBe done only with the IOL masterBe adjusted by putting machine on pseudophakic mode according to the type of material the IOL is made of when measuring the axial lengthHave 0.33 mm subtracted from the measured axial lengthHave 0.33 mm added to the measured axial length
Never need axial length measured because they have no lens to develop a cataractShould only have axial length measured with the IOL masterMay give a false axial length if the macula sits on the wall of the staphylomaShould not need any special considerations when measuring axial length
PMMAAcrylicSiliconeAll of the above
MultifocalToricMonofocalSulcus-placed
Should be Empty: