Nao Book + Test review Book Exam – Questions
With Fully Explained Solutions
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Terms in this set (382)
The first successful contact lens were Hapatic
molded to the shape of the cornea
known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable
Corneal Contact lenses: Are common designs for rigid and gas perm contacts
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
The majority of soft lenses fit today Semi scleral
are:
Corneal
Hapatic
Semi scleral
Hydrophobic
,A liquid coming in contact with a Spread evenly over the surface
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
A contact lens with a diameter larger Hapatic
than that of the cornea is called a ____
lens.
Corneal
Hydrophilic
Hydrophobic
Hapatic
All of the following are symptoms of a Burning
loose fitting lens except:
Constant awareness
Lid sensation
Burning
None of the above
Of those curves listed, which indicates 37.50 D
the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D
A contact lens was ordered with a 0.25 D steeper
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
,It is noticed that a rigid CL containing None of the above
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
A CL has a B.C. of 7.50 mm. Its 42.50 D
posterior peripheral curve would
most likely be:
7.45 mm
42.50 D
75.35 mm
30.00 D
The secondary curve of a rigid 2-4 D flatter than CPC
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
The term "hapaptic lens" is used in Scleral lens
reference to:
Prism ballast
Truncated
Scleral
Spin cast
The CPC of a CL measures 7.5 mm 45.00 D
radius of curvature. Its power in
diopters is:
41.00 D
42.00 D
45.00 D
47.00 D`
, The fitting characteristics of a gas All of the above
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
A soft CL demonstrates excessive Larger diameter lens
movement. This may be remedied by:
Larger diameter lens
Smaller diameter lens
Flatter lens
Disinfected lens
The term "sagittal value" refers to: Vaulting effect of a CL
Poor fitting lens
Scleral show
Vaulting effect of a CL
None of the above
When determining the best lens 1, 2, and 3
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
The gas permeability of a CAB lens is Lens thickness
largely dependent upon:
Diameter of the CPC
Width of the CPC
Lens thickness
Lens diameter
With Fully Explained Solutions
Save Groups
Terms in this set (382)
The first successful contact lens were Hapatic
molded to the shape of the cornea
known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable
Corneal Contact lenses: Are common designs for rigid and gas perm contacts
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
The majority of soft lenses fit today Semi scleral
are:
Corneal
Hapatic
Semi scleral
Hydrophobic
,A liquid coming in contact with a Spread evenly over the surface
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
A contact lens with a diameter larger Hapatic
than that of the cornea is called a ____
lens.
Corneal
Hydrophilic
Hydrophobic
Hapatic
All of the following are symptoms of a Burning
loose fitting lens except:
Constant awareness
Lid sensation
Burning
None of the above
Of those curves listed, which indicates 37.50 D
the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D
A contact lens was ordered with a 0.25 D steeper
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
,It is noticed that a rigid CL containing None of the above
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
A CL has a B.C. of 7.50 mm. Its 42.50 D
posterior peripheral curve would
most likely be:
7.45 mm
42.50 D
75.35 mm
30.00 D
The secondary curve of a rigid 2-4 D flatter than CPC
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
The term "hapaptic lens" is used in Scleral lens
reference to:
Prism ballast
Truncated
Scleral
Spin cast
The CPC of a CL measures 7.5 mm 45.00 D
radius of curvature. Its power in
diopters is:
41.00 D
42.00 D
45.00 D
47.00 D`
, The fitting characteristics of a gas All of the above
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
A soft CL demonstrates excessive Larger diameter lens
movement. This may be remedied by:
Larger diameter lens
Smaller diameter lens
Flatter lens
Disinfected lens
The term "sagittal value" refers to: Vaulting effect of a CL
Poor fitting lens
Scleral show
Vaulting effect of a CL
None of the above
When determining the best lens 1, 2, and 3
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
The gas permeability of a CAB lens is Lens thickness
largely dependent upon:
Diameter of the CPC
Width of the CPC
Lens thickness
Lens diameter
