Top Mark Questions and Correct Verified Answers
Nao Book + Test review Book Questions
and Correct Verified Answers
The first successful contact lens were molded to the shape of the cornea known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable
✓ Hapatic
Corneal Contact lenses:
Are a typical soft contact lens design
Bridge the limbus and some of the sclera
Are last resort contact lenses
Are common designs for rigid and gas perm contacts
✓ Are common designs for rigid and gas perm contacts
The majority of soft lenses fit today are:
Corneal
Hapatic
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
Semi scleral
Hydrophobic
✓ Semi scleral
A liquid coming in contact with a hydrophilic lens material with a relatively small
wetting angle would be likely to:
Form beads on the surface
Quickly evaporate
Spread evenly over the surface
None of the above
✓ Spread evenly over the surface
A contact lens with a diameter larger than that of the cornea is called a ____ lens.
Corneal
Hydrophilic
Hydrophobic
Hapatic
✓ Hapatic
All of the following are symptoms of a loose fitting lens except:
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
Constant awareness
Lid sensation
Burning
None of the above
✓ Burning
Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D
✓ 37.50 D
A contact lens was ordered with a base curve of 7.85 mm but was received back from
the lab with a base curve of 7.80 mm. The base cure of the actual lens is:
0.25 D flatter
0.25 D steeper
0.50 D flatter
0.50 D steeper
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ 0.25 D steeper
It is noticed that a rigid CL containing a base curve of 7.42mm is fitting quite loose. A
tighter fit may be achieved by changing the B.C. to:
7.46 mm
7.85 mm
8.04 mm
None of the above
✓ None of the above
A CL has a B.C. of 7.50 mm. Its posterior peripheral curve would most likely be:
7.45 mm
42.50 D
75.35 mm
30.00 D
✓ 42.50 D
The secondary curve of a rigid contact lens generally:
Is steeper than the CPC (Central posterior curve)
1-2 D flatter than CPC
Top Mark !!!
Nao Book + Test review Book Questions
and Correct Verified Answers
The first successful contact lens were molded to the shape of the cornea known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable
✓ Hapatic
Corneal Contact lenses:
Are a typical soft contact lens design
Bridge the limbus and some of the sclera
Are last resort contact lenses
Are common designs for rigid and gas perm contacts
✓ Are common designs for rigid and gas perm contacts
The majority of soft lenses fit today are:
Corneal
Hapatic
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
Semi scleral
Hydrophobic
✓ Semi scleral
A liquid coming in contact with a hydrophilic lens material with a relatively small
wetting angle would be likely to:
Form beads on the surface
Quickly evaporate
Spread evenly over the surface
None of the above
✓ Spread evenly over the surface
A contact lens with a diameter larger than that of the cornea is called a ____ lens.
Corneal
Hydrophilic
Hydrophobic
Hapatic
✓ Hapatic
All of the following are symptoms of a loose fitting lens except:
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
Constant awareness
Lid sensation
Burning
None of the above
✓ Burning
Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D
✓ 37.50 D
A contact lens was ordered with a base curve of 7.85 mm but was received back from
the lab with a base curve of 7.80 mm. The base cure of the actual lens is:
0.25 D flatter
0.25 D steeper
0.50 D flatter
0.50 D steeper
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ 0.25 D steeper
It is noticed that a rigid CL containing a base curve of 7.42mm is fitting quite loose. A
tighter fit may be achieved by changing the B.C. to:
7.46 mm
7.85 mm
8.04 mm
None of the above
✓ None of the above
A CL has a B.C. of 7.50 mm. Its posterior peripheral curve would most likely be:
7.45 mm
42.50 D
75.35 mm
30.00 D
✓ 42.50 D
The secondary curve of a rigid contact lens generally:
Is steeper than the CPC (Central posterior curve)
1-2 D flatter than CPC
Top Mark !!!
