Nao Book + Test review Book Exam
Questions with Correct Answers
The first successful contact lens were molded to the shape of the cornea known
as:
Corneal
Hapatic
Interpalpebral
Gas Permeable - CORRECT ANSWER-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 - CORRECT ANSWER-Are
common designs for rigid and gas perm contacts
The majority of soft lenses fit today are:
Corneal
,Hapatic
Semi scleral
Hydrophobic - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-Hapatic
All of the following are symptoms of a loose fitting lens except:
Constant awareness
Lid sensation
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,Burning
None of the above - CORRECT ANSWER-Burning
Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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
2-4 D flatter than CPC
None of the above - CORRECT ANSWER-2-4 D flatter than CPC
The term "hapaptic lens" is used in reference to:
Prism ballast
Truncated
Scleral
Spin cast - CORRECT ANSWER-Scleral lens
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Questions with Correct Answers
The first successful contact lens were molded to the shape of the cornea known
as:
Corneal
Hapatic
Interpalpebral
Gas Permeable - CORRECT ANSWER-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 - CORRECT ANSWER-Are
common designs for rigid and gas perm contacts
The majority of soft lenses fit today are:
Corneal
,Hapatic
Semi scleral
Hydrophobic - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-Hapatic
All of the following are symptoms of a loose fitting lens except:
Constant awareness
Lid sensation
COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED
,Burning
None of the above - CORRECT ANSWER-Burning
Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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
2-4 D flatter than CPC
None of the above - CORRECT ANSWER-2-4 D flatter than CPC
The term "hapaptic lens" is used in reference to:
Prism ballast
Truncated
Scleral
Spin cast - CORRECT ANSWER-Scleral lens
COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED
