Assessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by the use of thea. profile analyzer b. shadow graph c. keratometer d. burton light - a. profile analyzer Contact lens power should be specified ina. back vertex power b. sphero-cylinder power c. power i...
NCLE Test Questions with COMPLETE SOLUTION
Assessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by
the use of the-
a. profile analyzer
b. shadow graph
c. keratometer
d. burton light Correct Answer: a. profile analyzer
Contact lens power should be specified in-
a. back vertex power
b. sphero-cylinder power
c. power in situ
d. posterier apical radius Correct Answer: a. back vertex power
The slit-lamp illumination that gives an overall view of the cornea but limits detail is-
a. sclerotic scatter
b. diffuse
c. specular reflection
d. oscilatory Correct Answer: b. diffuse
When a keratometric miers reflected off a soft contact lens are only clear when the wearer blinks,
the lens fit is too-
a. small
b. large
c. steep
d. flat Correct Answer: c. steep
Transient keratometric mier distortion is usually due to-
a. pre-ocular tear film abnormalities
b. prolonged rigid lens wear
c. prolonged soft lens wear
d. irregular corneal astigmatism Correct Answer: a. pre-ocular tear film abnormalities
Epithelial edema which manifests itself clinically as central corneal haze, is verified by the slit
lamp using sclerotic scatter illumination. What specific technique does the examiner use to see
this condition?
a. the naked eye and an angle between the slit lamp beam and the eye of 90˚
b. the blue cobalt filter of the slit lamp and an angle of about 45˚
c. the green filter of the slit lamp with high magnification
d. high magnification and an angle between the beam and scope of 180˚ Correct Answer: a. the
naked eye and an angle between the slit lamp beam and the eye of 90˚
With a rigid contact lens in place a flourescein pattern shows a narrow bend horizontally wih a
concentration of flourescein inferiorly and superiorly under the lens. Which one of the following
type of astigmatism is represented by this pattern?
,a. lenticular astigmatism
b. residual astigmatism
c. against the rule astigmatism
d. with the rule astigmatism Correct Answer: d. with the rule astigmatism
Refractive Rx -3.00 -1.00 x 170
K's 42.00 @ 170/43.00 @ 80
Given the above Rx and K's he following diagnostic toric soft lens was used:
B.C. 8.8
Power -3.00 -1.00 x 180
During dianostic evalutation, the above lens rotated 10 clockwise. The lens ordered should have
an axis of:
a. 10
b. 180
c. 170
d. 160 Correct Answer: b. 180
Given the same circumstances from the above question, once the correctly ordered lens has been
dispensed, the rotational marks should settle at _______.
a. 6 o clock
b. 10 clockwise rotation
c. 10 counter clockwise rotation
d. none of the above Correct Answer: b. 10 clockwise rotation
An instrument that allows simultaneous verification of lens diameter, optic zone width, and
peripheral curve width is:
a. measuring magnifier
b. ophthalmometer
c. profile analyzer
d. radiuscope Correct Answer: a. measuring magnifier
(the book says d. radiuscope)
The instrument used for magnification of the edge of a rigid CL is a _______.
a. radiuscope
b. shadowgraph
c. profile analysis
d. keratometer Correct Answer: b. shadowgraph
Mary is wearing in her right eye RGP lens with a base curve of 43.50 and a power of +2.75. The
doctor refracts -0.75 sphere over this lens. If you wish to order her a new lens with a curve of
43.00, what will the new power be?
a. +1.50
b. +2.00
c. +2.50
d. +3.00 Correct Answer: c. +250
, Which of the following could be considered in the fitting of a keratoconus patient
1. aspheric
2. McGuire
3. Soper
4. tangent streak
a. 1 & 2
b. 2 & 3
c. 3 & 4
d. 1, 2 and 3 Correct Answer: d. 1, 2 and 3
Two designs helpful in orienting high riding myopic lenses are:
1. flattening the B.C. relationship
2. myo-flang
3. hyper-flang
4. prism ballast
a. 1 & 2
b. 1 & 3
c. 2 & 3
d. 3 & 4 Correct Answer: d. 3 & 4
Age/related signs of presbyopia include:
1. tear film abnormalities
2. reduce lid elasticity
3. lens opacities
4. pupil constriction
a. 1 only
b. 1 & 3
c. 2 & 4
d. all of the above Correct Answer: d. all of the above
A good example of a bifocal contact lens which may rotate without vision imparement is:
a. aspheric
b. executive
c. fused crescent
d. tangent streak Correct Answer: d. tangent streak
Keratoconus and penetrating keratoplasty fittings are best accomplished by which of the
following methods?
a. nomogram
b. Ks and Rx
c. diagnostic fitting
d. molded impression Correct Answer: c. diagnostic fitting
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