Nao Book + Test review Book Questions with 100% Verified Correct Answers 2024/2025
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Course
NAO
Institution
NAO
Nao Book + Test review Book Questions with 100% Verified Correct Answers 2024/2025
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 le...
Nao Book + Test review Book Questions with
100% Verified Correct Answers 2024/2025
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
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
The CPC of a CL measures 7.5 mm radius of curvature. Its power in diopters is:
41.00 D
42.00 D
45.00 D
47.00 D` - Correct Answer 45.00 D
The fitting characteristics of a gas permeable rigid CL may be altered by:
Changing the CPC's radius of curvature
Increasing the diameter
Widening the posterior peripheral curve
All of the above - Correct Answer All of the above
A soft CL demonstrates excessive movement. This may be remedied by:
None of the above - Correct Answer Vaulting effect of a CL
When determining the best lens material to use, which of hte following should be considered:
1. The patient's working conditions
2. Precorneal tear film
3. Full time vs. part time wear
1 only 2 and 3 only
1 and 3 only 1, 2, and 3 - Correct Answer 1, 2, and 3
The gas permeability of a CAB lens is largely dependent upon:
Diameter of the CPC
Width of the CPC
Lens thickness
Lens diameter - Correct Answer Lens thickness
A rigid gas permeable CL with a B.C. of 7.50 mm is found to be fitting slightly tight. To improve the fit
we might consider changing the B.C. to which of the following:
7.40 mm
7.45 mm
7.55 mm
7.65 mm - Correct Answer 7.55 mm
If the CPC of a rigid CL is held constant while the diameter is increased, it would result in:
Tighter fit
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