NCLE TEST REVIEW EXAM QUESTIONS WITH ACCURATE SOLUTIONS
Test that measures the quality of tears
B.U.T. Test (Break up time)
What is the O2 Permeability
DK values of a lens
What are the disadvantages of Soft Lenses?
Doesn't correct irregular astigmatism, favors deposit formation
Which test measures the quantity of tears?
The Schirmer test.
What are good results for the Schirmer test?
15 mm in 5 minutes.
What are dry eye results for the Schirmer test?
5-10 mm in 5 minutes.
,Neovascularization is mainly due to what?
Hypoxia, corneal edema, tight contact lens fit
The Radii and Power of an average cornea
7.85 mm or 43.00 D
What are the layers of the cornea?
Epithelium, Bowman's membrane, Stroma, Descemet's membrane, Endothelium
The main disadvantage of soft contact lenses
Protein deposits
What is it called when contact lenses are used to correct high myopia?
Orthokeratology (Ortho-K)
A contact lens with diameter that is larger than the cornea is a hydrophobic or hydrophilic
lens?
Hydrophilic lens
Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D, 8.60 mm,
49.00 D?
, 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 _____.
.25 D steeper than the ordered CTL.
This tear film layer will change the corneal surface from a hydrophobic surface to a
hydrophilic surface
Mucin Layer
This lipid layer has a primary function of ___________.
preventing evaporation of tears
What age group has the best prognosis for successful contact lens fitting?
13-38
When moved 5mm from it's original position the effective power of a 10.00 D lens will
change by _______.
0.5 D
When do we consider vertex distance compensation for spectacles and for CTL's?
spectacles at 7.00 D, CTL's at 4.00 D.
Test that measures the quality of tears
B.U.T. Test (Break up time)
What is the O2 Permeability
DK values of a lens
What are the disadvantages of Soft Lenses?
Doesn't correct irregular astigmatism, favors deposit formation
Which test measures the quantity of tears?
The Schirmer test.
What are good results for the Schirmer test?
15 mm in 5 minutes.
What are dry eye results for the Schirmer test?
5-10 mm in 5 minutes.
,Neovascularization is mainly due to what?
Hypoxia, corneal edema, tight contact lens fit
The Radii and Power of an average cornea
7.85 mm or 43.00 D
What are the layers of the cornea?
Epithelium, Bowman's membrane, Stroma, Descemet's membrane, Endothelium
The main disadvantage of soft contact lenses
Protein deposits
What is it called when contact lenses are used to correct high myopia?
Orthokeratology (Ortho-K)
A contact lens with diameter that is larger than the cornea is a hydrophobic or hydrophilic
lens?
Hydrophilic lens
Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D, 8.60 mm,
49.00 D?
, 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 _____.
.25 D steeper than the ordered CTL.
This tear film layer will change the corneal surface from a hydrophobic surface to a
hydrophilic surface
Mucin Layer
This lipid layer has a primary function of ___________.
preventing evaporation of tears
What age group has the best prognosis for successful contact lens fitting?
13-38
When moved 5mm from it's original position the effective power of a 10.00 D lens will
change by _______.
0.5 D
When do we consider vertex distance compensation for spectacles and for CTL's?
spectacles at 7.00 D, CTL's at 4.00 D.
