NCLE Advanced Certification Exam – Questions & Answers
The answer is D.
The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable
lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will
decrease the sagittal depth. Changing the power, which is accomplished by changing the anterior optical
zone, will not affect dthe dsagittal ddepth dof dthe dlens, dnor dwill dchanging dits dedge ddesign. d- dCorrect
danswer- d1. dThe dsagittal ddepth dof da drigid dgas dpermeable dcontact dlens dcan dbe daltered dwithout
dchanging dthe ddiameter dby:
A. Changing dthe dpower
B. Changing dthe dedge ddesign
C. Changing dthe dradius dof dcurvature dof dthe danterior doptical dzone
D. Changing dthe dradius dof dcurvature dof dthe dposterior doptical dzone
The danswer dis dA.
A dlens dis dtruncated dby dremoving da dsegment dof dthe dlower dedge dof da dcontact dlens. dThis dcreates
da dstraight dedge dthat dinteracts dwith dthe dlower dlid dand daids din dlens dpositioning. dOf dthe dlens
ddesigns dlisted din dthe dquestion, dthe donly done dthat drequires dprecise dpositioning dof dits doptical
dportions dis da dtranslating dbifocal dlens.
- dCorrect danswer- d2. dA dtruncation dis dused don da drigid dgas dpermeable dcontact dlens dto dhelp
denhance dthe dperformance dof dwhich dtype dof ddesign?
A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus
The danswer dis dB.
,A dlenticular dor dmyoflange ddesign dwill ddecrease dthe dmass dof dan daphakic dlens das dwell das
dincrease dthe dedge dprofile, dwhich dallows dit dto dinteract dmore dwith dthe dupper dlid dand daid din
dpositioning dof dthe dlens. d- dCorrect danswer- d3. dThe dmass dof dan daphakic drigid dgas dpermeable
dcontact dlens dcan dbe dreduced dby dmaking dthe dlens ddesign:
A. Spherical
B. Lenticular
C. Tricurve
D. Aspheric
The danswer dis dB.
Increasing dthe doptical dzone ddiameter dand dincreasing dthe doverall dlens ddiameter dwill dboth
dtighten dand dsteepen dthe drelationship dof dthe dlens dto dthe dcornea. dDecreasing dthe doptic dzone
ddiameter dwill dserve dto dflatten dand dloosen dthe dlens dto dcornea drelationship. dUsing da dprism-
ballasted dlens ddesign dwill dnot daffect dthe dlens dto dcornea drelationship das dit drelates dto dsagittal
ddepth. d- dCorrect danswer- d4. dIn dorder dto dtighten dthe dfit dof da drigid dgas dpermeable dlens dyou
dcan:
I. dIncrease dthe doptical dzone ddiameter
2. Decrease dthe doptical dzone ddiameter
3. Increase dthe doverall dlens ddiameter
4. Use da dprism dballasted dlens ddesign
A. 3 donly
B. 1&3
C. 2 donly
D. 2&3
The danswer dis dD.
A dhyperflange dwill ddecrease dedge dthickness das dwell das dlens dawareness d. dAspheric dperipheral
dcurves dchange dthe dposterior ddesign dof dthe dlens dbut ddo dnot dreduce dedge dthickness. dA dhigher
dDk dmaterial dwill dnot
,change dthe doverall dlens dedge dthickness. dA dmyoflange dwill dactually dadd dthickness dto dthe dlens
dedge dand dis dused dfor dhigh dplus dlenses dnot dhigh dminus dlenses. d- dCorrect danswer- d5. dA dhigh
dminus drigid dgas dpermeable dlens dwill dbe dthin dcentrally dwith drelatively dthick dedges. dTo dreduce
dthe dedge dthickness, dand dincrease doverall dcomfort, duse:
A. Aspheric dperipheral dcurves
B. A dmyoflange
C. A dhigher dDk dmaterial
D. A dhyperflange
The danswer dis dC.
One dwould drarely dpolish dor dattempt dto dmanipulate dthe dcentral dposterior dsurface dof da drigid dlens.
dApplying dpolishing dpressure dto dthe dmid-peripheral dand dthe dperipheral danterior dsurface dwould
dadd dplus dpower.
Applying dpolishing dpressure dto dthe dcentral danterior dsurface dwould dadd dminus dpower. d- dCorrect
danswer- d6. dTo dadd dminus dpower dto da drigid dcontact dlens dwith da drotating dmodifying dspindle,
done dwould:
A. Polish dthe dposterior dsurface dof dthe drigid dlens
B. Polish dthe dmid dperipheral danterior dsurface
C. Polish dthe dcentral danterior dsurface
D. Polish dthe dperipheral danterior dsurface
The danswer dis dA.
The dkeratometer dreadings dindicate dthe dneed dfor da dspherical dback dsurface, dwhich dwould drule dout
dthe duse dof da dbitoric dlens. dA dsoft dspherical dlens dwould dnot dcorrect dthe dmoderate damount dof
drefractive dastigmatism dthat dis dpresent, dnor dwould dthe dspherical drigid dgas dpermeable dlens. dA
dfront dsurface dtoric dRGP dwould dbest dmeet dthis dpatient's dneeds dsince dit dhas da dspherical dback
dsurface, dbut dhas da dtoric dfront dsurface dwhich dwould dcorrect dthe dresidual dastigmatism. d- dCorrect
danswer- d7. dWhich dlens ddesign dwould dprovide dthe dbest dvisual dacuity dfor da dpatient dwith dthe
dfollowing dinformation?
K's d42.00@ d180/ d42.50@90
dRx d-6.75 d+1.75 dcx d90
, A. Front dsurface dtoric drigid dgas dpermeable
B. Spherical drigid dgas dpermeable
C. Soft dsphere
D. Bitoric drigid dgas dpermeable
The danswer dis dA.
The dwetting dangle dof da drigid dgas dpermeable dmaterial ddescribes dhow da dfluid dspreads dover dthe
dsurface. dIt dis dimportant dto dremember, dhowever, dthat dwetting dangle dis da ddescription dof dthe
dmaterial doutside dof dthe dpatient's dnatural docular denvironment. dWithin dminutes dof dinsertion, da
drigid dlens dis dencapsulated din dthe dnatural dtear dmucin dand dthe dwetting dangle dof dthe dmaterial dis
dno dlonger dimportant. d- dCorrect danswer- d8.
Which dof dthe dfollowing ddescribes dthe dangle dthat dthe dedge dof da dbead dof dwater dmakes dwith dthe
dsurface dof da dplastic?
A. Wetting dangle
B. Surface dangle
C. Bead dangle
D. Reflection dangle
The danswer dis dB.
The dback dsurface dof da drigid dlens dwill dusually dcorrect donly dthe dastigmatism dthat dis dfound don
dthe dsurface dof dthe dcornea. dTherefore, dwhen dthere dis dsignificantly dmore dastigmatism din dthe
drefraction dthan don dthe dsurface dof dthe dcornea, dresidual dastigmatism dis danticipated. d- dCorrect
danswer- d9. dIf da dpatient dhas d1.50 dD dof drefractive dcylinder dand dkeratometer dreadings dof d44.00@
d180/ d44 d.50 d@ d90, da dspherical drigid dgas dpermeable dlens dwill:
A. Give dthe dpatient dtheir dbest dcorrectable dvision
B. Usually dresult din dresidual dastigmatism
C. Fit dpoorly
D. Be duncomfortable
The answer is D.
The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable
lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will
decrease the sagittal depth. Changing the power, which is accomplished by changing the anterior optical
zone, will not affect dthe dsagittal ddepth dof dthe dlens, dnor dwill dchanging dits dedge ddesign. d- dCorrect
danswer- d1. dThe dsagittal ddepth dof da drigid dgas dpermeable dcontact dlens dcan dbe daltered dwithout
dchanging dthe ddiameter dby:
A. Changing dthe dpower
B. Changing dthe dedge ddesign
C. Changing dthe dradius dof dcurvature dof dthe danterior doptical dzone
D. Changing dthe dradius dof dcurvature dof dthe dposterior doptical dzone
The danswer dis dA.
A dlens dis dtruncated dby dremoving da dsegment dof dthe dlower dedge dof da dcontact dlens. dThis dcreates
da dstraight dedge dthat dinteracts dwith dthe dlower dlid dand daids din dlens dpositioning. dOf dthe dlens
ddesigns dlisted din dthe dquestion, dthe donly done dthat drequires dprecise dpositioning dof dits doptical
dportions dis da dtranslating dbifocal dlens.
- dCorrect danswer- d2. dA dtruncation dis dused don da drigid dgas dpermeable dcontact dlens dto dhelp
denhance dthe dperformance dof dwhich dtype dof ddesign?
A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus
The danswer dis dB.
,A dlenticular dor dmyoflange ddesign dwill ddecrease dthe dmass dof dan daphakic dlens das dwell das
dincrease dthe dedge dprofile, dwhich dallows dit dto dinteract dmore dwith dthe dupper dlid dand daid din
dpositioning dof dthe dlens. d- dCorrect danswer- d3. dThe dmass dof dan daphakic drigid dgas dpermeable
dcontact dlens dcan dbe dreduced dby dmaking dthe dlens ddesign:
A. Spherical
B. Lenticular
C. Tricurve
D. Aspheric
The danswer dis dB.
Increasing dthe doptical dzone ddiameter dand dincreasing dthe doverall dlens ddiameter dwill dboth
dtighten dand dsteepen dthe drelationship dof dthe dlens dto dthe dcornea. dDecreasing dthe doptic dzone
ddiameter dwill dserve dto dflatten dand dloosen dthe dlens dto dcornea drelationship. dUsing da dprism-
ballasted dlens ddesign dwill dnot daffect dthe dlens dto dcornea drelationship das dit drelates dto dsagittal
ddepth. d- dCorrect danswer- d4. dIn dorder dto dtighten dthe dfit dof da drigid dgas dpermeable dlens dyou
dcan:
I. dIncrease dthe doptical dzone ddiameter
2. Decrease dthe doptical dzone ddiameter
3. Increase dthe doverall dlens ddiameter
4. Use da dprism dballasted dlens ddesign
A. 3 donly
B. 1&3
C. 2 donly
D. 2&3
The danswer dis dD.
A dhyperflange dwill ddecrease dedge dthickness das dwell das dlens dawareness d. dAspheric dperipheral
dcurves dchange dthe dposterior ddesign dof dthe dlens dbut ddo dnot dreduce dedge dthickness. dA dhigher
dDk dmaterial dwill dnot
,change dthe doverall dlens dedge dthickness. dA dmyoflange dwill dactually dadd dthickness dto dthe dlens
dedge dand dis dused dfor dhigh dplus dlenses dnot dhigh dminus dlenses. d- dCorrect danswer- d5. dA dhigh
dminus drigid dgas dpermeable dlens dwill dbe dthin dcentrally dwith drelatively dthick dedges. dTo dreduce
dthe dedge dthickness, dand dincrease doverall dcomfort, duse:
A. Aspheric dperipheral dcurves
B. A dmyoflange
C. A dhigher dDk dmaterial
D. A dhyperflange
The danswer dis dC.
One dwould drarely dpolish dor dattempt dto dmanipulate dthe dcentral dposterior dsurface dof da drigid dlens.
dApplying dpolishing dpressure dto dthe dmid-peripheral dand dthe dperipheral danterior dsurface dwould
dadd dplus dpower.
Applying dpolishing dpressure dto dthe dcentral danterior dsurface dwould dadd dminus dpower. d- dCorrect
danswer- d6. dTo dadd dminus dpower dto da drigid dcontact dlens dwith da drotating dmodifying dspindle,
done dwould:
A. Polish dthe dposterior dsurface dof dthe drigid dlens
B. Polish dthe dmid dperipheral danterior dsurface
C. Polish dthe dcentral danterior dsurface
D. Polish dthe dperipheral danterior dsurface
The danswer dis dA.
The dkeratometer dreadings dindicate dthe dneed dfor da dspherical dback dsurface, dwhich dwould drule dout
dthe duse dof da dbitoric dlens. dA dsoft dspherical dlens dwould dnot dcorrect dthe dmoderate damount dof
drefractive dastigmatism dthat dis dpresent, dnor dwould dthe dspherical drigid dgas dpermeable dlens. dA
dfront dsurface dtoric dRGP dwould dbest dmeet dthis dpatient's dneeds dsince dit dhas da dspherical dback
dsurface, dbut dhas da dtoric dfront dsurface dwhich dwould dcorrect dthe dresidual dastigmatism. d- dCorrect
danswer- d7. dWhich dlens ddesign dwould dprovide dthe dbest dvisual dacuity dfor da dpatient dwith dthe
dfollowing dinformation?
K's d42.00@ d180/ d42.50@90
dRx d-6.75 d+1.75 dcx d90
, A. Front dsurface dtoric drigid dgas dpermeable
B. Spherical drigid dgas dpermeable
C. Soft dsphere
D. Bitoric drigid dgas dpermeable
The danswer dis dA.
The dwetting dangle dof da drigid dgas dpermeable dmaterial ddescribes dhow da dfluid dspreads dover dthe
dsurface. dIt dis dimportant dto dremember, dhowever, dthat dwetting dangle dis da ddescription dof dthe
dmaterial doutside dof dthe dpatient's dnatural docular denvironment. dWithin dminutes dof dinsertion, da
drigid dlens dis dencapsulated din dthe dnatural dtear dmucin dand dthe dwetting dangle dof dthe dmaterial dis
dno dlonger dimportant. d- dCorrect danswer- d8.
Which dof dthe dfollowing ddescribes dthe dangle dthat dthe dedge dof da dbead dof dwater dmakes dwith dthe
dsurface dof da dplastic?
A. Wetting dangle
B. Surface dangle
C. Bead dangle
D. Reflection dangle
The danswer dis dB.
The dback dsurface dof da drigid dlens dwill dusually dcorrect donly dthe dastigmatism dthat dis dfound don
dthe dsurface dof dthe dcornea. dTherefore, dwhen dthere dis dsignificantly dmore dastigmatism din dthe
drefraction dthan don dthe dsurface dof dthe dcornea, dresidual dastigmatism dis danticipated. d- dCorrect
danswer- d9. dIf da dpatient dhas d1.50 dD dof drefractive dcylinder dand dkeratometer dreadings dof d44.00@
d180/ d44 d.50 d@ d90, da dspherical drigid dgas dpermeable dlens dwill:
A. Give dthe dpatient dtheir dbest dcorrectable dvision
B. Usually dresult din dresidual dastigmatism
C. Fit dpoorly
D. Be duncomfortable
