COT Contact Lens Review Questions With Complete
Solutions
A bifocal lens in which the power gradually changes from the
central area of the lens to a periphery is known as Correct
Answers An aspheric lens
A good example of a bifocal contact lens that may rotate without
vision impairment is Correct Answers Aspheric
A non wetting gas permeable lens may cause? Correct Answers
Hazy, filmy vision, Lens awareness, and Dryness or grittiness
A normal tear break-up time is: Correct Answers 10-12 seconds
A patient is diagnostically fit with a gas permeable lens with the
following parameters 42.50 -3.00 9.5. If you wish to flatten the
lens to cornea relationship, which of the following lenses would
you order? Correct Answers 42.50 -3.00 9.0
A patient with a high degree of with the rule astigmatism fitted
with a spherical gas permeable lens will show touch Correct
Answers On the horizontal meridian
A patient's K reading are 43.50 @ .50 @ 90. A spherical
GP lens can be expected to Correct Answers Displace down and
in, or down and out with each blink
A pre-presbyopic myopic patient who is still able to read with
single vision glasses may find that: Correct Answers They are
unable to see fine print when fit with contact lenses
,A prism ballast GP lens requires how much prism for proper
orientation? Correct Answers 0.75 to 1.50 D
A rigid contact lens measures + 15.00 D BVP. The FVP will
measure Correct Answers A lesser dioptric reading
A rigid lens correct astigmatism by Correct Answers Forming a
new spherical refracting surface in front of the cornea
A rigid lens showing a band shaped area of touch on the flattest
meridian is an indication of a lens fit on Correct Answers
Astigmatic cornea
A rigid lens showing apical touch is an indication of ? Correct
Answers A flat fit
A rigid lens showing central vaulting is indicative of Correct
Answers Apical clearance fit
A rigid lens showing excessive apical pooling is an indication
of? Correct Answers A steep fit
A rigid lens shows two curves on the convex surface when
measured with the radiuscope. On the lensometer, it shows one
power. What type of lens is this? Correct Answers Warped
A Soft contact lens that is too loose may show all of the
following EXCEPT? Correct Answers LImbal compression
, A soft lens has edge lift when observed on a cornea. How can
this be corrected? Correct Answers Steepen the base curve
A soft toric lens will correct Correct Answers Residual
Astigmatism, Moderate Astigmatism, Low Astigmatism
A technician can perform a preliminary evaluation of soft
contact lens movement by? Correct Answers Observing the
movement of the lens edge in relation to position of a
conjunctival vessel, Having the patient look up and blink,
Observing movement and lens lag in upward and lateral gaze
with a penlight
A warped lens will show __________ base curves, on the
radiuscope and a ______________ power on the lensometer
Correct Answers Two / Spherical
A whitish haze in the peripheral corneal stroma which does not
stain and is often seen in the elderly is know as: Correct
Answers Arcus Senilus
All of the following will enable the practitioner to verify the
overall gas permeable lens diameter except Correct Answers
Radiuscope
Amy's +8.50 D spectacles sit 12 mm from the cornea. The
power of a soft contact lens for Amy, properly vertexed, would
be? Correct Answers +9.50
Solutions
A bifocal lens in which the power gradually changes from the
central area of the lens to a periphery is known as Correct
Answers An aspheric lens
A good example of a bifocal contact lens that may rotate without
vision impairment is Correct Answers Aspheric
A non wetting gas permeable lens may cause? Correct Answers
Hazy, filmy vision, Lens awareness, and Dryness or grittiness
A normal tear break-up time is: Correct Answers 10-12 seconds
A patient is diagnostically fit with a gas permeable lens with the
following parameters 42.50 -3.00 9.5. If you wish to flatten the
lens to cornea relationship, which of the following lenses would
you order? Correct Answers 42.50 -3.00 9.0
A patient with a high degree of with the rule astigmatism fitted
with a spherical gas permeable lens will show touch Correct
Answers On the horizontal meridian
A patient's K reading are 43.50 @ .50 @ 90. A spherical
GP lens can be expected to Correct Answers Displace down and
in, or down and out with each blink
A pre-presbyopic myopic patient who is still able to read with
single vision glasses may find that: Correct Answers They are
unable to see fine print when fit with contact lenses
,A prism ballast GP lens requires how much prism for proper
orientation? Correct Answers 0.75 to 1.50 D
A rigid contact lens measures + 15.00 D BVP. The FVP will
measure Correct Answers A lesser dioptric reading
A rigid lens correct astigmatism by Correct Answers Forming a
new spherical refracting surface in front of the cornea
A rigid lens showing a band shaped area of touch on the flattest
meridian is an indication of a lens fit on Correct Answers
Astigmatic cornea
A rigid lens showing apical touch is an indication of ? Correct
Answers A flat fit
A rigid lens showing central vaulting is indicative of Correct
Answers Apical clearance fit
A rigid lens showing excessive apical pooling is an indication
of? Correct Answers A steep fit
A rigid lens shows two curves on the convex surface when
measured with the radiuscope. On the lensometer, it shows one
power. What type of lens is this? Correct Answers Warped
A Soft contact lens that is too loose may show all of the
following EXCEPT? Correct Answers LImbal compression
, A soft lens has edge lift when observed on a cornea. How can
this be corrected? Correct Answers Steepen the base curve
A soft toric lens will correct Correct Answers Residual
Astigmatism, Moderate Astigmatism, Low Astigmatism
A technician can perform a preliminary evaluation of soft
contact lens movement by? Correct Answers Observing the
movement of the lens edge in relation to position of a
conjunctival vessel, Having the patient look up and blink,
Observing movement and lens lag in upward and lateral gaze
with a penlight
A warped lens will show __________ base curves, on the
radiuscope and a ______________ power on the lensometer
Correct Answers Two / Spherical
A whitish haze in the peripheral corneal stroma which does not
stain and is often seen in the elderly is know as: Correct
Answers Arcus Senilus
All of the following will enable the practitioner to verify the
overall gas permeable lens diameter except Correct Answers
Radiuscope
Amy's +8.50 D spectacles sit 12 mm from the cornea. The
power of a soft contact lens for Amy, properly vertexed, would
be? Correct Answers +9.50
