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NCLE Test Review Questions And Answers With Verified Solutions (GRADED A+)
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NCLE Test Review Questions And Answers With Verified Solutions (GRADED A+)
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NCLE Test Review Questions AndAnswers With Verified Solutions
(GRADED A+)
Test that measures the quality of tears - ANSWER✔✔ B.U.T. Test (Break up time)
What is the O2 Permeability - ANSWER✔✔ DK values of a lens
What are the disadvantages of Soft Lenses? - ANSWER✔✔ Doesn't correct
irregular astigmatism, favors deposit formation
Which test measures the quantity of tears? - ANSWER✔✔ The Schirmer test.
What are good results for the Schirmer test? - ANSWER✔✔ 15 mm in 5 minutes.
What are dry eye results for the Schirmer test? - ANSWER✔✔ 5-10 mm in 5
minutes.
Neovascularization is mainly due to what? - ANSWER✔✔ Hypoxia, corneal edema,
tight contact lens fit
The Radii and Power of an average cornea - ANSWER✔✔ 7.85 mm or 43.00 D
What are the layers of the cornea? - ANSWER✔✔ Epithelium, Bowman's
membrane, Stroma, Descemet's membrane, Endothelium
,The main disadvantage of soft contact lenses - ANSWER✔✔ Protein deposits
What is it called when contact lenses are used to correct high myopia? -
ANSWER✔✔ Orthokeratology (Ortho-K)
A contact lens with diameter that is larger than the cornea is a hydrophobic or
hydrophilic lens? - ANSWER✔✔ Hydrophilic lens
Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D,
8.60 mm, 49.00 D? - ANSWER✔✔ 37.50 D
A CTL was ordered with a BC of 7.85 mm but was received from the lab with a BC
of 7.80 mm. The BC of the actual lens is _____. - ANSWER✔✔ .25 D steeper than
the ordered CTL.
A CTL with a BC of 7.42 mm is fitting too, a tighter fit may be achieved by
changing the base curve to: 7.46 , 7.85 mm, 8.04 mm, none of these? -
ANSWER✔✔ none of these... S.S.S. rule
A CTL has a BC of 7.50 mm, what would the PPC most likely be? 7.45 mm, 42.50 D,
7.35 mm, 30.00 D - ANSWER✔✔ 30.00 D= 11.25 mm/S.S.S. Rule
What does the term haptic Lens refer to? - ANSWER✔✔ A scleral CTL size
The secondary curve of a RGP CTL is generally flatter or steeper than the CPC and
by how much? - ANSWER✔✔ flatter by 2-4 diopters
, When the power of a curve changes by 0.50 D, the radius of curvature changes by
approximately how much? - ANSWER✔✔ 0.10 mm
When the CPC of a CTL measures 7.5 mm radius, how much is the power in
diopters? - ANSWER✔✔ 45.00 D
A soft CTL demonstrates excessive movement. This can be fixed with a lens that
has a _________ diameter. - ANSWER✔✔ Larger Diameter. (larger diameter-
steeper fit=tighter fit)
HEMA is an abbreviation commonly used to describe what lens? - ANSWER✔✔
The chemicalname for soft CTL
What is the main reason to utilize a ballasted CTL? - ANSWER✔✔ To have less
rotation of the CTL (Usually used in bifocal CTL's).
The Central portion of the back surface of the CTL is called _________. -
ANSWER✔✔ CPC (Central posterior curve) or the Base Curve (BC) or the optic
zone.
The distance between a flat surface and the back surface of the central portion of
the lens is called the ____________. - ANSWER✔✔ Sagital depth (vault, height)
A loose fitting CTL can be made to fit tighter by ____________ the radius of the
CPC. - ANSWER✔✔ shortening the radius of the CPC. S.S.S. Rule
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