National Certification Organization
for Opticians
The National Contact Lens Examiners (NCLE) ABO
American Board of Opticianry
CLRE Contact Lens Registry Examination
Course Title and Number: ABO NOCE Competency Exam
Exam Title: Registry Exam
Exam Date: Exam 2025- 2026
Instructor: [Insert Instructor’s Name]
Student Name: [Insert Student’s Name]
Student ID: [Insert Student ID]
Examination
180 minutes
Instructions:
1. Read each question carefully.
2. Answer all questions.
3. Use the provided answer sheet to mark your responses.
4. Ensure all answers are final before submitting the exam.
5. Please answer each question below and click Submit when you have completed
the Exam.
6. This test has a time limit, The test will save and submit automatically when the
time expires
7. This is Exam which will assess your knowledge on the course Learning
Resources.
Good Luck!
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NCLE - CLRE Contact Lens Exam 2 Review Questions
and Answers | 100% Pass Guaranteed | Graded A+ |
2025- 2026
The National Contact Lens Examiners NCLE ABO
American Board of Opticianry
CLRE Contact Lens Registry Examination
Read All Instructions Carefully and Answer All the
Questions Correctly Good Luck: -
What are some things you must consider when chosing a material
that lower vs. higher dk? - =Answer>> must consider power, fitting
circumstances, overnight wear, etc
What are some characteristics of lower dk? - =Answer>> More
stable, durable, less oxygen transmission, less deposits
Keep in mind that tears also provide oxygen!
What are some characteristics of higher dk? - =Answer>> Greater
oxygen transmission BUT more deposits, fragile, flexure, warpage
When ordering spherical GPs, what MUST you state/specify? -
=Answer>> BC, power (F), OAD, tint, material**
What are some optional things you might order for a Spherical GP? -
=Answer>> Optional: dot the OD, make OD and OS different tints,
plasma treatment, Tangible hydra-peg
o Generally, a handling tint of green, grey, or blue also helps locate
the lenses
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o Plasma treatment or Tangible (company) hydrapeg: better
wettability
Plasma treatment or Tangible (company) hydrapeg provides better
_______________ - =Answer>> wettability
You may specify the following or leave up to lab: - =Answer>> -
OZW
- SCR and SCW
- PCR and PCW
- Lenticular or single cut
- Blend
- CT
The posterior lens surface may be ___________, _____________,
____________, or __________ - =Answer>> bicurve, tricurve,
tetracurve, or aspheric
Which type of posterior lens surface is most commonly used for
average OAD lenses? - =Answer>> Tricurve
How should you chose BC, SC, and PC - =Answer>> 1) BC: match
the central cornea
2) 1mm flatter than BC
3) 2mm flatter than BC
What is the purpose of SC/PC? - =Answer>> -Enhance lens
centration and movement
- Tear exchange, clearing of debris
- Peripheral corneal integrity: Matches the flattening of the cornea in
the periphery
Define clearnace - =Answer>> distance from the lens edge
perpendicular to peripheral cornea
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For peripheral clearance/edge life, what will the clinician see? Versus
what the lab sees/does? - =Answer>> What the clinician sees:
pooling at lens edge, peripheral clearance
What the lab sees: calculating axial edge lift (AEL)
How the lab thinks about clearance
What is axial edge lift? - =Answer>> Axial edge lift (AEL):
geometrical calculation of vertical distance between lens edge and
extension of the BC radius of the lens
-Distance between where edge of lens is with SC and PC, and where it
would have been without them
-Constant axial edge lift designs keep sag constant at edge of lens
regarding power and OAD
Changing peripheral clearance Rule of thumb
What is the minimum change for clinical difference, and what would
you do it adequate on/too little clearance for SCR or PCR, and SCW or
PCW? - =Answer>> SCR or PCR: at least 1.0mm, Ex) 11.0 mm PCR à
flatten in-office to 12
mm or reorder
SCW or PCW: at least 0.20mm, ex) With 0.40 PCW à widen in-office to
0.60 mm or reorder
Example #1: The best BC is on but the PCR = 11 mm and shows
inadequate clearance. What will the new radius be?
A. 11.2 mm
B. 11.5 mm
C. 12 mm - =Answer>> ANSWER: C. 12 mm. Must change at least 1
mm to see a difference. Either flatten in office with diamond tool or
send back to lab.
When changing the peripheral curve, first be sure that: -
=Answer>> the fluorescein pattern is optimal
Increasing the peripheral clearance: - =Answer>> -Flatten and/or
widen peripheral curves, keeping
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