NCLE BASIC EXAM Questions and
Answers Graded A+
Acruate - Correct answer-Is a staining pattern that is indicative of poor insertion or
recentering techniques.
Decreased Blinking - Correct answer-Can result in discomfort from prolonged use
in digital devices
Lens Equilibration - Correct answer-When the CL reaches the same temperature as
the tear film
Buffering Agent - Correct answer-Is used to control tear pH, anytime the pH level
of an ingredient or part is altered, it is called buffering
What to do when a soft CL gets stuck to cornea - Correct answer-Irrigate the eye
with ophthalmic solutions until the lens becomes loose. never water
Hydrogren Peroxide Systems - Correct answer-most effective way to remove
deposits
Purpose of Wetting Solution - Correct answer-Create a hydrophilic lens surface .
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,Gas permeable lenses are hydrophobic and need a wetting agent to make them
hydrophilic.
Edge Flare - Correct answer-Is a method of determininig whether or not a lens is
inverted prior to insertion
Expiration - Correct answer-Date is the last date the product is still effective
Corneal Dehydration - Correct answer-Side effect of taking a decongestant.
Antihistamines dry the corneal surface
When using a a multipurpose solution the wearer should rub the lens for at leaset -
Correct answer-20 seconds
Contacts should be soaked for a minimum of - Correct answer-4 hours, if a time is
not given by the contact lens manufacturer
Primary purpose of surfactant cleaner - Correct answer-To remove loose debris
from the lens surface
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,Surfactant, reduces the surface tension of water on a surface allowing water to
spread out and clean the surface
Heat based cleaning system - Correct answer-Is most likely to shorten the lifespan
of contact lenses
A contact lens wearing schedule should be provided - Correct answer-Verbal and
written
How to clean residue from gas permeable lenses - Correct answer-Saline
Saline is the only rinsing agent listed. Hydrogen peroxide if used as rinsing agents
will burn the eye
Spectacle Blur - Correct answer-Is caused by temporary deformation of the corneal
surface from inappropiratly fit hard lenses
Benzalkonium Chloride - Correct answer-A common preservative found in gas
permeable solutions.
This perservative may cause eye irritation, punctate staining and ulcerative
keratopathy. Can discolor soft lenses.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, How often should surfactant cleaner be used - Correct answer-After removal.
Surfactants are more effective on fresher debris on the lens surface
How to increase lens movement on a CL - Correct answer-Peripheral curves to be
wider
Widening periferal curves through blending allows for increased movement.
INCREASING total diameter and STEEPENING the posterior curve will tighten
the fit. The peripheral optical zone is located adjacent to the central optical zone
for creating a second focal pt 2-10 degree
Drawback of Silicone lense - Correct answer-Wettability - how easily liquid
spreads over a surface
Silicone is hydrophobic
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
Answers Graded A+
Acruate - Correct answer-Is a staining pattern that is indicative of poor insertion or
recentering techniques.
Decreased Blinking - Correct answer-Can result in discomfort from prolonged use
in digital devices
Lens Equilibration - Correct answer-When the CL reaches the same temperature as
the tear film
Buffering Agent - Correct answer-Is used to control tear pH, anytime the pH level
of an ingredient or part is altered, it is called buffering
What to do when a soft CL gets stuck to cornea - Correct answer-Irrigate the eye
with ophthalmic solutions until the lens becomes loose. never water
Hydrogren Peroxide Systems - Correct answer-most effective way to remove
deposits
Purpose of Wetting Solution - Correct answer-Create a hydrophilic lens surface .
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Gas permeable lenses are hydrophobic and need a wetting agent to make them
hydrophilic.
Edge Flare - Correct answer-Is a method of determininig whether or not a lens is
inverted prior to insertion
Expiration - Correct answer-Date is the last date the product is still effective
Corneal Dehydration - Correct answer-Side effect of taking a decongestant.
Antihistamines dry the corneal surface
When using a a multipurpose solution the wearer should rub the lens for at leaset -
Correct answer-20 seconds
Contacts should be soaked for a minimum of - Correct answer-4 hours, if a time is
not given by the contact lens manufacturer
Primary purpose of surfactant cleaner - Correct answer-To remove loose debris
from the lens surface
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,Surfactant, reduces the surface tension of water on a surface allowing water to
spread out and clean the surface
Heat based cleaning system - Correct answer-Is most likely to shorten the lifespan
of contact lenses
A contact lens wearing schedule should be provided - Correct answer-Verbal and
written
How to clean residue from gas permeable lenses - Correct answer-Saline
Saline is the only rinsing agent listed. Hydrogen peroxide if used as rinsing agents
will burn the eye
Spectacle Blur - Correct answer-Is caused by temporary deformation of the corneal
surface from inappropiratly fit hard lenses
Benzalkonium Chloride - Correct answer-A common preservative found in gas
permeable solutions.
This perservative may cause eye irritation, punctate staining and ulcerative
keratopathy. Can discolor soft lenses.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, How often should surfactant cleaner be used - Correct answer-After removal.
Surfactants are more effective on fresher debris on the lens surface
How to increase lens movement on a CL - Correct answer-Peripheral curves to be
wider
Widening periferal curves through blending allows for increased movement.
INCREASING total diameter and STEEPENING the posterior curve will tighten
the fit. The peripheral optical zone is located adjacent to the central optical zone
for creating a second focal pt 2-10 degree
Drawback of Silicone lense - Correct answer-Wettability - how easily liquid
spreads over a surface
Silicone is hydrophobic
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
