ROUB Study Guide Exam Questions With
Correct Answers
If |your |biometry |instrument |has |one |pseudophakic |eye-type |setting, |what |is |the |only |IOL |
material |that |can |accurately |be |measured? |- |CORRECT |ANSWER✔✔-Polymethyl |methacrylate |
(PMMA)
If |a |gain |setting |is |increased |in |order |to |obtain |a |100% |tall |retina |and |sclera |echo, |what |type |
of |cataract |is |being |evaluated? |- |CORRECT |ANSWER✔✔-A |dense |cataract
What |transducer |frequency |is |generally |used |for |a |biometry |A-scan |probe? |- |CORRECT |
ANSWER✔✔-10 |MHz
What |is |the |velocity |of |a |biometer |that |only |uses |an |average |velocity |to |measure |the |entire |
axial |length? |- |CORRECT |ANSWER✔✔-1550 |m/sec
What |is |one |of |the |most |important |features |of |a |biometer? |- |CORRECT |ANSWER✔✔-Display |
screen
What |are |the |velocity |settings |for |a |phakic |eye? |- |CORRECT |ANSWER✔✔-1532 |m/sec |for |the |
aqueous; |1641 |m/sec |for |the |lens; |and, |1532 |m/sec |for |the |vitreous |cavity
What |should |the |examiner |do |to |reduce |the |presence |of |a |reverberation |echo |created |by |a |
dense |cataract? |- |CORRECT |ANSWER✔✔-Reduce |the |gain
What |is |the |term |for |the |electronic |calipers |that |measure |the |distance |between |two |or |more |
anatomic |interfaces? |- |CORRECT |ANSWER✔✔-Gates
,Of |the |following |settings |on |the |biometer |(gain, |gates, |A-scan |probe |frequency, |eye |type, |and |
screen |brightness), |which |cannot |be |changed |by |the |examiner? |- |CORRECT |ANSWER✔✔-A-
scan |probe |frequency
What |is |the |proper |sound |velocity |used |to |measure |the |distance |between |the |anterior |and |
posterior |lens |interfaces |in |a |phakic |eye? |- |CORRECT |ANSWER✔✔-1641 |m/sec
When |performing |immersion |biometry, |which |gate |in |relation |to |the |initial |spike |represents |
the |cornea? |- |CORRECT |ANSWER✔✔-Corneal |gate |is |to |the |right |of |the |initial |spike
What |is |the |possible |cause |for |a |biometry |instrument |to |indicate |an |unusually |short |
measurement |of |a |pseudophakic |eye |with |a |PMMA |implant? |- |CORRECT |ANSWER✔✔-Multiple
|signal |of |the |echo |with |improper |identification |of |the |retina
What |biometer |setting |changes |the |degree |of |echo |amplification? |- |CORRECT |ANSWER✔✔-
Gain
What |is |the |term |for |the |relative |strength |or |amplitude |of |an |echo |displayed |on |a |biometer? |- |
CORRECT |ANSWER✔✔-Reflectivity
When |measuring |an |eye |that |has |no |crystalline |lens, |the |instrument |should |be |set |on |which |
eye |type? |- |CORRECT |ANSWER✔✔-Aphakic
What |is |the |term |for |the |"markers" |or |"cursors" |displayed |on |the |screen |of |a |biometry |
instrument |that |provide |electronic |measurements |of |distance |between |two |or |more |acoustic |
interfaces? |- |CORRECT |ANSWER✔✔-Gates
, What |is |the |term |for |the |capacity |of |an |ultrasound |instrument |to |display |two |or |more |
interfaces |that |are |very |anatomically |close |to |one |another |as |separate |echoes? |- |CORRECT |
ANSWER✔✔-Resolution
How |does |increasing |the |gain |setting |on |the |biometer |affect |the |display |echo? |- |CORRECT |
ANSWER✔✔-It |increases |the |amount |of |amplification |of |the |echo
What |is |the |range |of |ophthalmic |biometry |frequencies? |- |CORRECT |ANSWER✔✔-8-12 |MHz
How |is |the |resolution |affected |when |the |gain |is |set |at |maximum? |- |CORRECT |ANSWER✔✔-The
|resolution |is |less
A |non-focused |sound |beam |is |always |utilized |by |which |type |of |scan? |- |CORRECT |ANSWER✔✔-
Diagnostic |A-scan
What |scan |is |used |to |obtain |a |two-dimensional |image |of |the |globe? |- |CORRECT |ANSWER✔✔-
Diagnostic |B-scan
What |is |the |term |for |a |one-dimensional |amplitude |scan? |- |CORRECT |ANSWER✔✔-A-scan
The |strength |of |an |echo |is |dependent |on |what |three |factors? |- |CORRECT |ANSWER✔✔-Gain, |
difference |in |density, |and |proper |alignment
What |type |of |scan |uses |Prager |or |scleral |shells? |- |CORRECT |ANSWER✔✔-Immersion |A-scan
How |often |should |the |filter |of |a |biometry |instrument |be |vacuumed? |- |CORRECT |ANSWER✔✔-
Once |a |month
Correct Answers
If |your |biometry |instrument |has |one |pseudophakic |eye-type |setting, |what |is |the |only |IOL |
material |that |can |accurately |be |measured? |- |CORRECT |ANSWER✔✔-Polymethyl |methacrylate |
(PMMA)
If |a |gain |setting |is |increased |in |order |to |obtain |a |100% |tall |retina |and |sclera |echo, |what |type |
of |cataract |is |being |evaluated? |- |CORRECT |ANSWER✔✔-A |dense |cataract
What |transducer |frequency |is |generally |used |for |a |biometry |A-scan |probe? |- |CORRECT |
ANSWER✔✔-10 |MHz
What |is |the |velocity |of |a |biometer |that |only |uses |an |average |velocity |to |measure |the |entire |
axial |length? |- |CORRECT |ANSWER✔✔-1550 |m/sec
What |is |one |of |the |most |important |features |of |a |biometer? |- |CORRECT |ANSWER✔✔-Display |
screen
What |are |the |velocity |settings |for |a |phakic |eye? |- |CORRECT |ANSWER✔✔-1532 |m/sec |for |the |
aqueous; |1641 |m/sec |for |the |lens; |and, |1532 |m/sec |for |the |vitreous |cavity
What |should |the |examiner |do |to |reduce |the |presence |of |a |reverberation |echo |created |by |a |
dense |cataract? |- |CORRECT |ANSWER✔✔-Reduce |the |gain
What |is |the |term |for |the |electronic |calipers |that |measure |the |distance |between |two |or |more |
anatomic |interfaces? |- |CORRECT |ANSWER✔✔-Gates
,Of |the |following |settings |on |the |biometer |(gain, |gates, |A-scan |probe |frequency, |eye |type, |and |
screen |brightness), |which |cannot |be |changed |by |the |examiner? |- |CORRECT |ANSWER✔✔-A-
scan |probe |frequency
What |is |the |proper |sound |velocity |used |to |measure |the |distance |between |the |anterior |and |
posterior |lens |interfaces |in |a |phakic |eye? |- |CORRECT |ANSWER✔✔-1641 |m/sec
When |performing |immersion |biometry, |which |gate |in |relation |to |the |initial |spike |represents |
the |cornea? |- |CORRECT |ANSWER✔✔-Corneal |gate |is |to |the |right |of |the |initial |spike
What |is |the |possible |cause |for |a |biometry |instrument |to |indicate |an |unusually |short |
measurement |of |a |pseudophakic |eye |with |a |PMMA |implant? |- |CORRECT |ANSWER✔✔-Multiple
|signal |of |the |echo |with |improper |identification |of |the |retina
What |biometer |setting |changes |the |degree |of |echo |amplification? |- |CORRECT |ANSWER✔✔-
Gain
What |is |the |term |for |the |relative |strength |or |amplitude |of |an |echo |displayed |on |a |biometer? |- |
CORRECT |ANSWER✔✔-Reflectivity
When |measuring |an |eye |that |has |no |crystalline |lens, |the |instrument |should |be |set |on |which |
eye |type? |- |CORRECT |ANSWER✔✔-Aphakic
What |is |the |term |for |the |"markers" |or |"cursors" |displayed |on |the |screen |of |a |biometry |
instrument |that |provide |electronic |measurements |of |distance |between |two |or |more |acoustic |
interfaces? |- |CORRECT |ANSWER✔✔-Gates
, What |is |the |term |for |the |capacity |of |an |ultrasound |instrument |to |display |two |or |more |
interfaces |that |are |very |anatomically |close |to |one |another |as |separate |echoes? |- |CORRECT |
ANSWER✔✔-Resolution
How |does |increasing |the |gain |setting |on |the |biometer |affect |the |display |echo? |- |CORRECT |
ANSWER✔✔-It |increases |the |amount |of |amplification |of |the |echo
What |is |the |range |of |ophthalmic |biometry |frequencies? |- |CORRECT |ANSWER✔✔-8-12 |MHz
How |is |the |resolution |affected |when |the |gain |is |set |at |maximum? |- |CORRECT |ANSWER✔✔-The
|resolution |is |less
A |non-focused |sound |beam |is |always |utilized |by |which |type |of |scan? |- |CORRECT |ANSWER✔✔-
Diagnostic |A-scan
What |scan |is |used |to |obtain |a |two-dimensional |image |of |the |globe? |- |CORRECT |ANSWER✔✔-
Diagnostic |B-scan
What |is |the |term |for |a |one-dimensional |amplitude |scan? |- |CORRECT |ANSWER✔✔-A-scan
The |strength |of |an |echo |is |dependent |on |what |three |factors? |- |CORRECT |ANSWER✔✔-Gain, |
difference |in |density, |and |proper |alignment
What |type |of |scan |uses |Prager |or |scleral |shells? |- |CORRECT |ANSWER✔✔-Immersion |A-scan
How |often |should |the |filter |of |a |biometry |instrument |be |vacuumed? |- |CORRECT |ANSWER✔✔-
Once |a |month
