NAO BOOK + TEST REVIEW BOOK
Questions and Guide Answers
100% Verified Graded A+
1. The first successful contact lens were molded to the shape of the cornea
known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable:
Answer: Hapatic
2. 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:
Answer: Are common designs for rigid and gas perm contacts
3. The majority of soft lenses fit today are:
Corneal
Hapatic
Semi scleral
Hydrophobic:
Answer: Semi scleral
4. 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:
Answer: Spread evenly over the surface
5. A contact lens with a diameter larger than that of the cornea is called a
lens.
Corneal
,Hydrophilic
Hydrophobic
Hapatic:
Answer: Hapatic
6. All of the following are symptoms of a loose fitting lens except:
Constant awareness
Lid sensation
Burning
None of the above:
Answer: Burning
7. Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D:
Answer: 37.50 D
8. 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:
Answer: 0.25 D steeper
9. 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:
Answer: None of the above
10. 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
Questions and Guide Answers
100% Verified Graded A+
1. The first successful contact lens were molded to the shape of the cornea
known as:
Corneal
Hapatic
Interpalpebral
Gas Permeable:
Answer: Hapatic
2. 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:
Answer: Are common designs for rigid and gas perm contacts
3. The majority of soft lenses fit today are:
Corneal
Hapatic
Semi scleral
Hydrophobic:
Answer: Semi scleral
4. 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:
Answer: Spread evenly over the surface
5. A contact lens with a diameter larger than that of the cornea is called a
lens.
Corneal
,Hydrophilic
Hydrophobic
Hapatic:
Answer: Hapatic
6. All of the following are symptoms of a loose fitting lens except:
Constant awareness
Lid sensation
Burning
None of the above:
Answer: Burning
7. Of those curves listed, which indicates the flattest base curve?
7.5 mm
37.50 D
8.6 mm
49.00 D:
Answer: 37.50 D
8. 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:
Answer: 0.25 D steeper
9. 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:
Answer: None of the above
10. 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
