National Certification Organization
for Opticians
The National Contact Lens Examiners (NCLE) ABO
American Board of Opticianry
CLRE Contact Lens Registry Examination
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 Comprehensive Exam 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: -
1. Keratitis sicca is a severe dryness of the cornea. This leaves the
cornea at risk exposing it to complications related to secondary
infection.
2. Upon removal of the crystalline lens, the patient is:
A. Aphakic
B. Myopic
C. Hyperopic
D. Astigmatic - =Answer>> A. Aphakic
3. Is the absence of the crystalline lens
4. The following Rx represents:
5. OD +2.00 = 20/20
6. OS -3.00 -2.00 x 180 = 20/20
A. Presbyopia
B. Anisometropia
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C. Amblyopia
D. Emmetropia - =Answer>> B. Anisometropia
7. Is present when the refractive errors of a patient's two eyes are
so different from one another that retinal images of disparate
sizes result. Because of the different sizes, fusion of the two
images may not occur.
8. The above patient will best achieve stereopsis with which of the
following modalities?
A. Contact lenses
B. Spectacles
C. IOL
D. Scleral lenses - =Answer>> A. Contact lenses
9. A patient's depth perception (stereopsis) will be compromised if
fitted with spectacles. An IOL (intraocular lens) is used for
aphakia. Scleral rigid lenses are also impractical and rarely used
today.
10. Tom's spectacles with a power of -12.00 +0.50 x 90, sit
10mm in front of his cornea. The likely soft contact lens
prescription for Tom would be:
A. -10.50
B. -11.75
C. -12.00
D. -12.50 - =Answer>> A. -10.50
11. The vertex distance correction is usually derived from a
standard table. In the conversion of a prescription from the
spectacle plane to the corneal plane, additional plus power is
needed
12. The keratometer is an instrument used to measure:
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A. Corneal curvature
B. Lens power
C. Lens diameter
D. Lens thickness - =Answer>> A. Corneal curvature
13. An instrument used to evaluate corneal irregularity by
reflecting concentric circle from the patient's cornea is called a:
A. Burton lamp
B. Con-Ta-Chek
C. Topogometer
D. Placido disk - =Answer>> D. Placido disk
14. A burton lamp evaluates fluorescein patterns in the
absence of a slit lamp. A Con-Ta-Chek is an attachment to the
keratometer that enables one to read the base curve in the
absence of a radiuscope. A topogometer is also an attachment
for the keratometer and is used to define the corneal apex
15. Which auxiliary trial lens will extend the keratometer to
approximately 61.00D?
A. -1.25D
B. +1.25D
C. -1.50D
D. +1.50D - =Answer>> B. +1.25
16. The range of the keratometer is 36.00D to 52.00D. To
extend the range above 52.00D, a +1.25 lens is used
17. Wearing lenses in high altitudes and dry environments may
result in complaints of all but the following:
A. Photophobia
B. Chalazion
C. Grittiness
D. Burning sensation - =Answer>> B. Chalazion
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