NCLE Practice Test Practical Questions and Answers
100% Solved
Spectacle Blur -Answer✔ Temporary blurred vision upon switching from contact lenses to
eyeglasses
Crystalline Lens -Answer✔ The main focusing mechanism of the eye
The Main Supply of Oxygen to the cornea is provided by -Answer✔ Tear Film
Keratometry mires which are only clear when the wearer blinks are indicative of a -Answer✔
Steep Fit
Keratometry mires which blur immediately following blink are indicative of a -Answer✔ Flat
Fit
A rigid contact lens shows a flourescein pattern inferiorly and superiorly beneath the lens.
This
is indicative of which type of astigmatism -Answer✔ With-the-rule
A bi-toric rigid lens will show -Answer✔ Two base curves on the radiuscope, sphero-cylindrical
rx on the lensometer
The ANSI tolerance for a soft lens diameter is -Answer✔ ±0.25
The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D -Answer✔ ±0.18
The ANSI tolerance for RGP Base Curve is -Answer✔ ±0.05mm
,The ANSI tolerance for RGP lens diameter is -Answer✔ ±0.05mm
Which instrument allows simultaneous verification of lens diameter, optic zone width, and
peripheral curve -Answer✔ Radiuscope
Which instrument is best to observe the blends of rigid contact lens -Answer✔ Profile
Analyzer
If a toric lens rotates to the fitters left -Answer✔ Add the degrees of rotation to the prescribed
axis
If a toric lens rotates to the fitters right -Answer✔ Subtract (minus) the degrees of rotation to
the prescribed axis
Increasing the sagittal depth of a rigid lens will -Answer✔ Not change the effective power of
the
lens
How would you stop rotation in a bifocal lens -Answer✔ Truncate the lens
Change the base curve
Increase prism
The DK value of a lens is -Answer✔ Oxygen permeability of that material
The original rigid material used in contact lens manufacturing -Answer✔
, Polymethylmethacrylate (PMMA)
Orthokeratology may be defined as -Answer✔ Reduction of refractive errors by corneal
molding
with the contact lens applications
Steep Fluorescein Pattern -Answer✔ Bright green pooling center, very faint green pooling on
diameter of lens
Flat Fluorescein Pattern -Answer✔ Bright green pooling on diameter of lens, very faint green
in
center
Against-the-rule Astigmatism Pattern -Answer✔ Bright green pooling horizontally, faint green
pooling vertically
With-the-rule Astigmatism Pattern -Answer✔ Bright green pooling vertically, faint green
pooling
horizontally
Prism Ballast -Answer✔ Common technique to stabilize lens from rotating. Added thickness
will
position lens inferiorly (bottom of cornea)
100% Solved
Spectacle Blur -Answer✔ Temporary blurred vision upon switching from contact lenses to
eyeglasses
Crystalline Lens -Answer✔ The main focusing mechanism of the eye
The Main Supply of Oxygen to the cornea is provided by -Answer✔ Tear Film
Keratometry mires which are only clear when the wearer blinks are indicative of a -Answer✔
Steep Fit
Keratometry mires which blur immediately following blink are indicative of a -Answer✔ Flat
Fit
A rigid contact lens shows a flourescein pattern inferiorly and superiorly beneath the lens.
This
is indicative of which type of astigmatism -Answer✔ With-the-rule
A bi-toric rigid lens will show -Answer✔ Two base curves on the radiuscope, sphero-cylindrical
rx on the lensometer
The ANSI tolerance for a soft lens diameter is -Answer✔ ±0.25
The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D -Answer✔ ±0.18
The ANSI tolerance for RGP Base Curve is -Answer✔ ±0.05mm
,The ANSI tolerance for RGP lens diameter is -Answer✔ ±0.05mm
Which instrument allows simultaneous verification of lens diameter, optic zone width, and
peripheral curve -Answer✔ Radiuscope
Which instrument is best to observe the blends of rigid contact lens -Answer✔ Profile
Analyzer
If a toric lens rotates to the fitters left -Answer✔ Add the degrees of rotation to the prescribed
axis
If a toric lens rotates to the fitters right -Answer✔ Subtract (minus) the degrees of rotation to
the prescribed axis
Increasing the sagittal depth of a rigid lens will -Answer✔ Not change the effective power of
the
lens
How would you stop rotation in a bifocal lens -Answer✔ Truncate the lens
Change the base curve
Increase prism
The DK value of a lens is -Answer✔ Oxygen permeability of that material
The original rigid material used in contact lens manufacturing -Answer✔
, Polymethylmethacrylate (PMMA)
Orthokeratology may be defined as -Answer✔ Reduction of refractive errors by corneal
molding
with the contact lens applications
Steep Fluorescein Pattern -Answer✔ Bright green pooling center, very faint green pooling on
diameter of lens
Flat Fluorescein Pattern -Answer✔ Bright green pooling on diameter of lens, very faint green
in
center
Against-the-rule Astigmatism Pattern -Answer✔ Bright green pooling horizontally, faint green
pooling vertically
With-the-rule Astigmatism Pattern -Answer✔ Bright green pooling vertically, faint green
pooling
horizontally
Prism Ballast -Answer✔ Common technique to stabilize lens from rotating. Added thickness
will
position lens inferiorly (bottom of cornea)
