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 National Contact Lens 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: -
What is scleral scatter used to view? - =Answer>> details of the
cornea like edema and other opacities
Wratten #12 yellow filter - =Answer>> used to enhance Fluorscein
pattern
radial keratotomy - =Answer>> a surgical procedure to treat
myopia
Silicone Acrylate - =Answer>> first gas permeable rigid lens with
silicone added to PMMA to increase Dk value
Fluorosilicone Acrylate - =Answer>> rigid material with fluorine
added for increased wettability along with silicone for oxygen
permeability
hybrid lens - =Answer>> Has a rigid gas permeable lens in the
center surrounded by a soft contact lens material skirt
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truncation - =Answer>> the removal of the bottom (inferior) edge of
the
fenestration - =Answer>> holes put in non-permeable lenses to
allow tear exchange (used in scleral lenses now)
surfactant - =Answer>> contact lens cleaner that requires digital
rubbing on the lens
Rose Bengal Stain - =Answer>> stain used to view
devitalized/dead/degenerated tissue
What is a green filter used to view? - =Answer>> vascularization
Another term for hydrogen peroxide solutions - =Answer>>
oxidative solution
chemical solutions end in the suffix ___ - =Answer>> -ate (borate,
bicarbonate, citrate)
What preservative ingredient is soley used in soft contact lenses? -
=Answer>> polyquarternium-1
What preservative ingredient is soley used in GP lenses? -
=Answer>> benzalkonium chloride
In base curvature, each 0.25D equals ___ mm of radius - =Answer>>
0.05
An apical alignment GP lens is fit with a base curve ___ than K -
=Answer>> flatter
How is the GP lens diameter generally fit in relation the the HVID? -
=Answer>> smaller than HVID (by approximately 2.3mm
sometimes)
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Fit an apical clearance lens base curve ___ than K - =Answer>>
steeper
conjunctival injection - =Answer>> enlargement of blood vessels in
conjunctiva
Projection Magnifier - =Answer>> Also known as a shadowgraph.
Used to view the integrity of contact lens edges, blends, transition
zones and surface quality. Certain models have a millimeter marking
for diameter verification.
How often should a contact lens case be replaced? - =Answer>>
every 1-3 mons
lacrimal lake - =Answer>> collecting area of the tears at the medial
angle of the eye
bullous keratopathy - =Answer>> corneal edema with painful
blisters in the epithelium due to corneal endothelial dysfunction
disinfectant agent for patients with allergic reactions - =Answer>>
hydrogen peroxide
DK/L Stands for: a. oxygen permeability, b. thermal conduction, c.
oxygen transmissibility, d. wettability - =Answer>> C. Oxygen
Transmissibility
A prism ballast, trunctated lens is on a left eye. The cylinder axis is 90
degrees. Prism base is noted to rotate 15 ddegrees nasally. What
cylinder axis shoud be ordered to compensate for the rotation?
a. 95, b. 105, c. 110, d. 75, e. 80 - =Answer>> B. 105
Small superficial linear stains are characteristic of?
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