NCLE SAM'S Test Flashcards
The first successful contact lenses which were originally molded to conform to the shape of the
cornea were known as lenses.
haptic
Corneal contact lenses:
are the most conmon design for rigid and gas permable lenses
The majority of soft lenses fit today are:
semi-scleral
A liquid coming in contact with a hydrophilic lens material with a relatively small wetting angle
would be likely to:
spread evenly over its surface
A contact lens with a diameter larger than that of the cornea is
haptic
All of the following are symptoms of a loose fitting lens except:
burning
A contact lens was ordered with a base curve of 7.85 mm but was received back from the laboratory
with a base curve measuring 7.80 mm. The base curve ofthe actual lens is:
0.25 D steeper than the lens ordered
A contact lens has a base curve of7.50 mm. Its posterior peripheral curve would most likely be
Your answer:
42.50 D
The secondary curve of a rigid contact lens generally:
2 to 4 diopters flatter than the CPC
The term “Haptic Lens” is used in reference to:
a scleral lens
The CPC of a contact lens measures 7.5 mm radius of curvature. Its power in diopters is:
45.00
A soft contact lens demonstrates excessive movement. This may be remedied by:
a larger diameter lens
The term “sagittal value” refers to:
the vaulting effect of a contact lens
When determining the best lens material to use, which of the following should be considered?
the patient’s working conditions
- precomeal tear film
- full time vs. part time wear
The gas permeability of a CAB lens is largely dependent upon:
the lens thickness
