COT Contact Lenses Exam Review
Manual Questions And 100% Correct
Solutions | 2026 Update
In spite of the current popularity of gas permeable and soft lenses, PMMA
lenses are still useful in cases of: - Ans--high astigmatism
A PMMA lens would be contraindicated in all of the following except: - Ans--
Ectatic corneal dystrophy
The characteristics of PMMA material include all of the following except: -
Ans--Oxygen permeable
Because of the characteristics of PMMA lenses, almost all PMMA lens
wearers have some degree of: - Ans--Corneal anoxia
The characteristic of soft lens material that is responsible for most of the
lens advantages (and disadvantages) is it's - Ans--Ability to absorbe water
Soft lens material includes all of the following polymers except - Ans--
Cellulos acetate butyrate
The lower the the water content of soft contact lens: - Ans--the more durable
the lens
Aspheric back surface - Ans--creates drag between the lens edge and the
periphery of the cornea
Bioflange - Ans--weights the lens with a thick bottom edge
Dynamic stabilization - Ans--A thin edge on the top and bottom portions of
the lens with a lens thicker center
,Posterior toric - Ans--toric correction is on the back of the lens, where it can
physically "match up" to the cornea
Prism ballast - Ans--weights the bottom part of the lens with prism
Truncation - Ans--a flat edge on the bottom portion of the lens
A soft toric lens that is thick across the belly and thinned out at the top and
bottom is called a: - Ans--Double slab-off lens
If lens rotation is to the left, one should add the number of degrees of
rotation to the: - Ans--Axis of the patients refraction
The major factors influencing toric soft lens stability is/are: - Ans--The
contour, postion, and tightness of the lids
Toric rigid lenses may be required by patients: - Ans--whose refrctive and
corneal astigmatism agree in power but not in axis.
with spherical corneas and lenticular astigmatism
Whose corneal astigmatism is greater than their refractive astigmatism
Decentration and rocking of gas permeable lens caused by astigmatism
may be compensated for by using a: - Ans--larger lens
A patient with a highly toric cornea may require a gas permeable lens that is:
- Ans--thiker or more rigid
The amount of astigmatism that is present after the patient is fitted with
lenses is referred to as: - Ans--residual astigmatism
The patient with astigmatisim may tolerate spherical soft contact lenses up
to the point that the astigmatism is: - Ans--lenticular
The patient with astigmatism may tolerate a spherical rigid contact lens if
the astigmatisim is - Ans--3.00 diopters or less
Simultaneous vision bifocal contact lenses: - Ans--have distance correction
in the center and near correction in an outer ring
, The limiting factor in fitting simultaneous bifocal contacts is: - Ans--The size
of the patient's pupil
The most common visual complaint with simultaneous bifocal contacts is: -
Ans--Ghost images
The reverse design simultaneous bifocal contact lenses involves: - Ans--
Having near correction in the center and the distance correction in the outer
ring
A patient with reverse simultaneous bifocal contact lenses will find that in
very bright light, he: - Ans--can only see up close
Alternating vision bifocal contact lenses: - Ans--have an upper segment for
distance and lower segment for near
In addition to patient motivation, successful fit of alternation vision bifocal
contact lenses depends on: - Ans--the position of the lower lid
If the patient is wearing alternating vision bifocal contact lenses and is
attempting to read on prices on a shelf above shoulder level - Ans--the print
will be blurred
An advantage of gas permeable bifocal contact lenses vs soft bifocal
contact lenses in an alternating vision vision design is: - Ans--it is easier for
the patient to "find" the right spot to look through
Fewer and fewer patients are needing aphakic contact lens correction
because: - Ans--IOL lenses are highly successful
Considerations for fitting contacts on average aphakic eye include all of the
following except: - Ans--Senility
When an aphakic patient switches form glasses to contact lenses objects
will appear to be: - Ans--Father away
Manual Questions And 100% Correct
Solutions | 2026 Update
In spite of the current popularity of gas permeable and soft lenses, PMMA
lenses are still useful in cases of: - Ans--high astigmatism
A PMMA lens would be contraindicated in all of the following except: - Ans--
Ectatic corneal dystrophy
The characteristics of PMMA material include all of the following except: -
Ans--Oxygen permeable
Because of the characteristics of PMMA lenses, almost all PMMA lens
wearers have some degree of: - Ans--Corneal anoxia
The characteristic of soft lens material that is responsible for most of the
lens advantages (and disadvantages) is it's - Ans--Ability to absorbe water
Soft lens material includes all of the following polymers except - Ans--
Cellulos acetate butyrate
The lower the the water content of soft contact lens: - Ans--the more durable
the lens
Aspheric back surface - Ans--creates drag between the lens edge and the
periphery of the cornea
Bioflange - Ans--weights the lens with a thick bottom edge
Dynamic stabilization - Ans--A thin edge on the top and bottom portions of
the lens with a lens thicker center
,Posterior toric - Ans--toric correction is on the back of the lens, where it can
physically "match up" to the cornea
Prism ballast - Ans--weights the bottom part of the lens with prism
Truncation - Ans--a flat edge on the bottom portion of the lens
A soft toric lens that is thick across the belly and thinned out at the top and
bottom is called a: - Ans--Double slab-off lens
If lens rotation is to the left, one should add the number of degrees of
rotation to the: - Ans--Axis of the patients refraction
The major factors influencing toric soft lens stability is/are: - Ans--The
contour, postion, and tightness of the lids
Toric rigid lenses may be required by patients: - Ans--whose refrctive and
corneal astigmatism agree in power but not in axis.
with spherical corneas and lenticular astigmatism
Whose corneal astigmatism is greater than their refractive astigmatism
Decentration and rocking of gas permeable lens caused by astigmatism
may be compensated for by using a: - Ans--larger lens
A patient with a highly toric cornea may require a gas permeable lens that is:
- Ans--thiker or more rigid
The amount of astigmatism that is present after the patient is fitted with
lenses is referred to as: - Ans--residual astigmatism
The patient with astigmatisim may tolerate spherical soft contact lenses up
to the point that the astigmatism is: - Ans--lenticular
The patient with astigmatism may tolerate a spherical rigid contact lens if
the astigmatisim is - Ans--3.00 diopters or less
Simultaneous vision bifocal contact lenses: - Ans--have distance correction
in the center and near correction in an outer ring
, The limiting factor in fitting simultaneous bifocal contacts is: - Ans--The size
of the patient's pupil
The most common visual complaint with simultaneous bifocal contacts is: -
Ans--Ghost images
The reverse design simultaneous bifocal contact lenses involves: - Ans--
Having near correction in the center and the distance correction in the outer
ring
A patient with reverse simultaneous bifocal contact lenses will find that in
very bright light, he: - Ans--can only see up close
Alternating vision bifocal contact lenses: - Ans--have an upper segment for
distance and lower segment for near
In addition to patient motivation, successful fit of alternation vision bifocal
contact lenses depends on: - Ans--the position of the lower lid
If the patient is wearing alternating vision bifocal contact lenses and is
attempting to read on prices on a shelf above shoulder level - Ans--the print
will be blurred
An advantage of gas permeable bifocal contact lenses vs soft bifocal
contact lenses in an alternating vision vision design is: - Ans--it is easier for
the patient to "find" the right spot to look through
Fewer and fewer patients are needing aphakic contact lens correction
because: - Ans--IOL lenses are highly successful
Considerations for fitting contacts on average aphakic eye include all of the
following except: - Ans--Senility
When an aphakic patient switches form glasses to contact lenses objects
will appear to be: - Ans--Father away
