COT CONTACT LENS REVIEW QUESTIONS
WITH DETAILED VERIFIED ANSWERS
A bifocal lens in which the power gradually changes from the
central area of the lens to a periphery is known as - correct
answer- An aspheric lens
A good example of a bifocal contact lens that may rotate
without vision impairment is - correct answer- Aspheric
A non wetting gas permeable lens may cause? - correct answer-
Hazy, filmy vision, Lens awareness, and Dryness or grittiness
A normal tear break-up time is: - correct answer- 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 answer- 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
answer- On the horizontal meridian
A patient's K reading are 43.50 @ .50 @ 90. A spherical
GP lens can be expected to - correct answer- 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 answer- 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 answer- 0.75 to 1.50 D
A rigid contact lens measures + 15.00 D BVP. The FVP will
measure - correct answer- A lesser dioptric reading
A rigid lens correct astigmatism by - correct answer- 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 answer-
Astigmatic cornea
A rigid lens showing apical touch is an indication of ? - correct
answer- A flat fit
A rigid lens showing central vaulting is indicative of - correct
answer- Apical clearance fit
A rigid lens showing excessive apical pooling is an indication of?
- correct answer- 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 answer- Warped
A Soft contact lens that is too loose may show all of the
following EXCEPT? - correct answer- LImbal compression
A soft lens has edge lift when observed on a cornea. How can
this be corrected? - correct answer- Steepen the base curve
, A soft toric lens will correct - correct answer- Residual
Astigmatism, Moderate Astigmatism, Low Astigmatism
A technician can perform a preliminary evaluation of soft
contact lens movement by? - correct answer- 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 answer- 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
answer- Arcus Senilus
All of the following will enable the practitioner to verify the
overall gas permeable lens diameter except - correct answer-
Radiuscope
WITH DETAILED VERIFIED ANSWERS
A bifocal lens in which the power gradually changes from the
central area of the lens to a periphery is known as - correct
answer- An aspheric lens
A good example of a bifocal contact lens that may rotate
without vision impairment is - correct answer- Aspheric
A non wetting gas permeable lens may cause? - correct answer-
Hazy, filmy vision, Lens awareness, and Dryness or grittiness
A normal tear break-up time is: - correct answer- 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 answer- 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
answer- On the horizontal meridian
A patient's K reading are 43.50 @ .50 @ 90. A spherical
GP lens can be expected to - correct answer- 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 answer- 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 answer- 0.75 to 1.50 D
A rigid contact lens measures + 15.00 D BVP. The FVP will
measure - correct answer- A lesser dioptric reading
A rigid lens correct astigmatism by - correct answer- 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 answer-
Astigmatic cornea
A rigid lens showing apical touch is an indication of ? - correct
answer- A flat fit
A rigid lens showing central vaulting is indicative of - correct
answer- Apical clearance fit
A rigid lens showing excessive apical pooling is an indication of?
- correct answer- 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 answer- Warped
A Soft contact lens that is too loose may show all of the
following EXCEPT? - correct answer- LImbal compression
A soft lens has edge lift when observed on a cornea. How can
this be corrected? - correct answer- Steepen the base curve
, A soft toric lens will correct - correct answer- Residual
Astigmatism, Moderate Astigmatism, Low Astigmatism
A technician can perform a preliminary evaluation of soft
contact lens movement by? - correct answer- 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 answer- 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
answer- Arcus Senilus
All of the following will enable the practitioner to verify the
overall gas permeable lens diameter except - correct answer-
Radiuscope
