Contact Lens COT Questions And Full
Set Correct Answers| Updated
Most practitioners would prefer to fit a gas permeable lens instead of a
tradition hard (PMMA) lens (hard plastic lens) because:
A. Vision with a gas permeable lens is better
B. Gas permeable lenses are easier to handle
C. Gas permeable lenses are available for astigmatism
D. Corneal warpage is less with gas permeable lenses - Ans--D. Corneal
warpage is less with gas permeable lenses
In spite of the current popularity of gas permeable and soft lenses, PMMA
lenses are still useful in cases of:
A. High astigmatism
B. High hyperopia
C. High myopia
D. Presbyopia - Ans--A. High astigmatism
-Think keratoconus
A PMMA lens would be contraindicated in all of the following EXCEPT:
A. Ectatic corneal dystrophy
B. Corneal anesthesia
C. Lid anomalies
D. Dry eyes - Ans--A. Ectatic corneal dystrophy
The characteristics of PMMA material include all of the following EXCEPT:
A. Resists warpage
B. Oxygen permeable
C. Wets well
D. Easy to clean - Ans--B. Oxygen permeable
-NOT oxygen permeable
-Hard plastic lens (mostly outdated)
, Because of the characteristics of PMMA lenses, almost all PMMA lens
wearers have some degree of:
A. Injection
B. Photophobia
C. Corneal anoxia
D. Neovascularization - Ans--C. Corneal anoxia
-due to lack of oxygen getting to the cornea
The characteristics of soft lens material that is responsible for most of the
lens's advantages (and disadvantages) is its:
A. Tear exchange under the lens
B. Ability to absorb water
C. Resistance to deposits
D. larger diameter - Ans--B. Ability to absorb water
Soft lens material includes all of the following polymers EXCEPT:
A. Hydrogel
B. Silicone
C. CAB (cellulose acetate butyrate)
D. HEMA (hydroxyethyl methacrylate) - Ans--C. CAB (cellulose acetate
butyrate)
The lower the water content of a soft lens:
A. The more durable the lens
B. The greater oxygen permeability
C. The less frequently it needs to be cleaned
D. The smaller the diameter - Ans--A. The more durable the lens
-The lower the water content, the more rigid the lens is (more durable)
One of the main risks of wearing soft contact lenses is:
A. Modifications are impossible
B. Residual astigmatism
C. Infection
D. Lens discoloration - Ans--C. Infection
All of the following are contraindications to soft Toric lenses EXCEPT:
A. Lenticular astigmatism
B. Irregular corneal astigmatism
Set Correct Answers| Updated
Most practitioners would prefer to fit a gas permeable lens instead of a
tradition hard (PMMA) lens (hard plastic lens) because:
A. Vision with a gas permeable lens is better
B. Gas permeable lenses are easier to handle
C. Gas permeable lenses are available for astigmatism
D. Corneal warpage is less with gas permeable lenses - Ans--D. Corneal
warpage is less with gas permeable lenses
In spite of the current popularity of gas permeable and soft lenses, PMMA
lenses are still useful in cases of:
A. High astigmatism
B. High hyperopia
C. High myopia
D. Presbyopia - Ans--A. High astigmatism
-Think keratoconus
A PMMA lens would be contraindicated in all of the following EXCEPT:
A. Ectatic corneal dystrophy
B. Corneal anesthesia
C. Lid anomalies
D. Dry eyes - Ans--A. Ectatic corneal dystrophy
The characteristics of PMMA material include all of the following EXCEPT:
A. Resists warpage
B. Oxygen permeable
C. Wets well
D. Easy to clean - Ans--B. Oxygen permeable
-NOT oxygen permeable
-Hard plastic lens (mostly outdated)
, Because of the characteristics of PMMA lenses, almost all PMMA lens
wearers have some degree of:
A. Injection
B. Photophobia
C. Corneal anoxia
D. Neovascularization - Ans--C. Corneal anoxia
-due to lack of oxygen getting to the cornea
The characteristics of soft lens material that is responsible for most of the
lens's advantages (and disadvantages) is its:
A. Tear exchange under the lens
B. Ability to absorb water
C. Resistance to deposits
D. larger diameter - Ans--B. Ability to absorb water
Soft lens material includes all of the following polymers EXCEPT:
A. Hydrogel
B. Silicone
C. CAB (cellulose acetate butyrate)
D. HEMA (hydroxyethyl methacrylate) - Ans--C. CAB (cellulose acetate
butyrate)
The lower the water content of a soft lens:
A. The more durable the lens
B. The greater oxygen permeability
C. The less frequently it needs to be cleaned
D. The smaller the diameter - Ans--A. The more durable the lens
-The lower the water content, the more rigid the lens is (more durable)
One of the main risks of wearing soft contact lenses is:
A. Modifications are impossible
B. Residual astigmatism
C. Infection
D. Lens discoloration - Ans--C. Infection
All of the following are contraindications to soft Toric lenses EXCEPT:
A. Lenticular astigmatism
B. Irregular corneal astigmatism
