CPOA Exam Questions and Answers
Graded A+
What 3 characteristics must beconsidered in the design of an ophthalmic lens? -
Correct answer-Thickness, chromatic aberration and weight
The liquid
form of sodium fluorescence is very susceptible to - Correct answer-Pseudomonas
aeruginosa
True or false? A topical anesthetic should be prescribed a patient with a corneal
abrasion - Correct answer-False
A manufacturing standard established by the ANSI for glass lens is? - Correct
answer-The lens must be heat or chemically tempered
3 advantages of CR-39 - Correct answer-Lighter, do not fog as bad and less glare
3 advantages of glass lens over CR-39 - Correct answer-Do not scratch as easily,
they are thinner and improved visual performance
A normal visible iris diameter measurement is: - Correct answer-10.5 to 12.5 mm
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,Normal blink rate is: - Correct answer-10 to 15 blinks per minute
A clinical sign of giant papillary conjunctivitis - Correct answer-Papillae greater
than 1mm in size, papillae located in all five zones
Why is polycarbonate a good choice of lens material for children and monocular
patients? - Correct answer-More impact resistant
What is the material used to make high index plastic lens? - Correct answer-
Polyurethane
What is the Proper prescription to correct the refractive error with the following K
reading 42.50@90 and 41.75 is: - Correct answer-+0.75 @ 180
What is concise red a large diameter for a rigid contact lens - Correct answer-9.3
mm
The base curve radius is generally very similar to - Correct answer-The flat K
reading
What factors must be considered in order to dispense the thinnest lens possible? -
Correct answer-Frame size, lens material, aspheric design and center thickness
What is the ANDI standard for drop-ball testing in dress eyewear? - Correct
answer-Mush withstand the impact of a 5/8 inch still ball from 50 inch
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,What is the ANSI Standard for drop-ball testing for safety glasses? - Correct
answer-Must withstand the impact of a 1 inch still ball Dropped form 50 inches
What other standard in addition to drop ball testing applies to industry safety
glasses - Correct answer-Minimal thickness of 3 mm
In the following statement true or false ? polycarbonate,high index plastic, and CR
39 lens do not have to be routinely tested in the lab by the drop-ball test - Correct
answer-True
Name the two methods of treating glass lenses for impact resistance - Correct
answer-Heating tempering and chemical tempering
What type of PD is measured one fitting progressive addition lenses - Correct
answer-Monocular
When dispensing a pair of progressive addition lenses the manufacturer markings
will - Correct answer-help the dispenser make the final frame adjustments
What is an identifying factor of an executive or Franklin bifocal - Correct answer-
A large bridge that runs across the entire width of the frame
What is the most likely intermediate power if the near power is +3.00 - Correct
answer-+1.50
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, What contact lens material is also is also used in cooking wear? - Correct answer-
Fluorine
A lens with two different curves on the back and one one spherical front curve is
known as a: - Correct answer-Toric base curve lens
What is true about cast molded contact lens - Correct answer-They are the least
expensive contact lens to manufacture
Opaque tint - Correct answer-Tint that Changes the present eye color
The normal soft lens diameter ranges from - Correct answer-13.5 to 15.5 mm
Prism ballast and truncation of a toric lens are used to - Correct answer-Stabilize
the lens
What type of patient would best benefit from extended wear contacts - Correct
answer-Aphakic
A slot gauge is used to: - Correct answer-Determine the diameter of the contact
lens
A nurse states that she has to tilt her head back to read the small numbers on the IV
bag with her current bifocals this is causing her neck to her which of the following
lens design should be discussed with her - Correct answer-Double segment bifocal
lens
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Graded A+
What 3 characteristics must beconsidered in the design of an ophthalmic lens? -
Correct answer-Thickness, chromatic aberration and weight
The liquid
form of sodium fluorescence is very susceptible to - Correct answer-Pseudomonas
aeruginosa
True or false? A topical anesthetic should be prescribed a patient with a corneal
abrasion - Correct answer-False
A manufacturing standard established by the ANSI for glass lens is? - Correct
answer-The lens must be heat or chemically tempered
3 advantages of CR-39 - Correct answer-Lighter, do not fog as bad and less glare
3 advantages of glass lens over CR-39 - Correct answer-Do not scratch as easily,
they are thinner and improved visual performance
A normal visible iris diameter measurement is: - Correct answer-10.5 to 12.5 mm
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Normal blink rate is: - Correct answer-10 to 15 blinks per minute
A clinical sign of giant papillary conjunctivitis - Correct answer-Papillae greater
than 1mm in size, papillae located in all five zones
Why is polycarbonate a good choice of lens material for children and monocular
patients? - Correct answer-More impact resistant
What is the material used to make high index plastic lens? - Correct answer-
Polyurethane
What is the Proper prescription to correct the refractive error with the following K
reading 42.50@90 and 41.75 is: - Correct answer-+0.75 @ 180
What is concise red a large diameter for a rigid contact lens - Correct answer-9.3
mm
The base curve radius is generally very similar to - Correct answer-The flat K
reading
What factors must be considered in order to dispense the thinnest lens possible? -
Correct answer-Frame size, lens material, aspheric design and center thickness
What is the ANDI standard for drop-ball testing in dress eyewear? - Correct
answer-Mush withstand the impact of a 5/8 inch still ball from 50 inch
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,What is the ANSI Standard for drop-ball testing for safety glasses? - Correct
answer-Must withstand the impact of a 1 inch still ball Dropped form 50 inches
What other standard in addition to drop ball testing applies to industry safety
glasses - Correct answer-Minimal thickness of 3 mm
In the following statement true or false ? polycarbonate,high index plastic, and CR
39 lens do not have to be routinely tested in the lab by the drop-ball test - Correct
answer-True
Name the two methods of treating glass lenses for impact resistance - Correct
answer-Heating tempering and chemical tempering
What type of PD is measured one fitting progressive addition lenses - Correct
answer-Monocular
When dispensing a pair of progressive addition lenses the manufacturer markings
will - Correct answer-help the dispenser make the final frame adjustments
What is an identifying factor of an executive or Franklin bifocal - Correct answer-
A large bridge that runs across the entire width of the frame
What is the most likely intermediate power if the near power is +3.00 - Correct
answer-+1.50
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, What contact lens material is also is also used in cooking wear? - Correct answer-
Fluorine
A lens with two different curves on the back and one one spherical front curve is
known as a: - Correct answer-Toric base curve lens
What is true about cast molded contact lens - Correct answer-They are the least
expensive contact lens to manufacture
Opaque tint - Correct answer-Tint that Changes the present eye color
The normal soft lens diameter ranges from - Correct answer-13.5 to 15.5 mm
Prism ballast and truncation of a toric lens are used to - Correct answer-Stabilize
the lens
What type of patient would best benefit from extended wear contacts - Correct
answer-Aphakic
A slot gauge is used to: - Correct answer-Determine the diameter of the contact
lens
A nurse states that she has to tilt her head back to read the small numbers on the IV
bag with her current bifocals this is causing her neck to her which of the following
lens design should be discussed with her - Correct answer-Double segment bifocal
lens
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
