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NAO (NCLE) REVIEW QUESTIONS AND ANSWERS RATED A.
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NAO (NCLE) REVIEW QUESTIONS AND ANSWERS RATED A.
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NAO (NCLE) REVIEW QUESTIONS ANDANSWERS RATED A.
what angle identifies the smallest angle?
Correct Answer -minimum visual angle
if the diameter is kept constant and the base curve is changed, the sagittal
depth of the lens changes. How steep is the base curve, how large is the sag,
and how steep is the fit?
Correct Answer -steeper the base curve, the larger the sag and the steeper
the fit
given the K's 42.00@180/42.50@90, a manifest Rx of -1.00-.50x180, and your
patient wanting to wear his lenses only on the weekends, which type of lens
would you suggest?
Correct Answer -soft spherical
describe the axial edge lift
Correct Answer -the vertical distance from the lens edge to an extension of
the base curve of a lens
what is apical bearing or apical touch
Correct Answer -posterior lens curvature resting on the corneal apex
what is an interpalpebral fit?
Correct Answer -a well centered rigid lens that fits between the upper and
lower eyelids, where the upper lid does not control the position of the lens.
, in fitting a contact lens, if the fitter fits a lens on "K", what does that mean?
Correct Answer -the lenses are fitted to parallel the flatter meridian of the
cornea
What is fenestration?
Correct Answer -tiny hole in a contact lens, made to enhance the
transmission of tears and oxygen through the lens material
how to evaluate tear quality and quantity
Correct Answer -tear break up time; or use Schirmers #1, or fluorescein,
rose Bengal
Schirmer tear test
Correct Answer -test performed using filter paper strips to measure tear
quantity
when fitting bitoric lenses, you should fit the lens ______ than K, and add plus
to compensate for the lacrimal lens
Correct Answer -.50 flatter
Given Rx of -2.50 -2.00 x180 and K readings of 44.50 @180/46.50@90,
determine the CPC
Correct Answer -45.25
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