NCLE Practice Test Practical Exam 2023 with complete
solution
Steep Fluorescein Pattern
Bright green pooling center, very faint green pooling on diameter of lens
Flat Fluorescein Pattern
Bright green pooling on diameter of lens, very faint green in center
Against-the-rule Astigmatism Pattern
Bright green pooling horizontally, faint green pooling vertically
With-the-rule Astigmatism Pattern
Bright green pooling vertically, faint green pooling horizontally
Prism Ballast
Common technique to stabilize lens from rotating. Added thickness will position lens
inferiorly (bottom of cornea)
Truncation
Cutting off .50mm to 1.50mm of bottom edge of lens to provide stability. Reduces
diameter, making a looser fit.
Double Slab-off
Lens is thicker centrally and thinner at top and bottom of lens. Provides comfort to
wearer, but may cause some stability issues.
Aspheric Lens Design
Hyperflange
Used to correct high riding minus lenses.
Myoflange
Used to correct low riding plus lenses.
Monovision
Corrects presbyopia in contact wearers. One eye uses distance (dominant) and the
other eye uses reading (resessive)
Segment Bifocal
Same concept as spectacle bifocal. Must be prism ballast. Often crescent shaped.
Toric Lenses
Anterior (front surface), back spherical surface or posterior (back surface), toric back
curve
Front Toric Lens
Corrects a low to moderate amount of corneal astigmatism
Back Toric Lens
Corrects a mid to high amount of corneal astigmatism
Bitoric Lens
Corrects 1.50D of corneal astigmatism and high residual astigmatism
Aphakic
Condition of no crystalline lens
Psuedophakic
Implant, intraocular lens
Corneal Edema
Always causes a poor fitting lens
, Spectacle Blur
Temporary blurred vision upon switching from contact lenses to eyeglasses
Crystalline Lens
The main focusing mechanism of the eye
The Main Supply of Oxygen to the cornea is provided by
Tear Film
Keratometry mires which are only clear when the wearer blinks are indicative of a
Steep Fit
Keratometry mires which blur immediately following blink are indicative of a
Flat Fit
A rigid contact lens shows a flourescein pattern inferiorly and superiorly beneath
the lens. This is indicative of which type of astigmatism
With-the-rule
A bi-toric rigid lens will show
Two base curves on the radiuscope, sphero-cylindrical rx on the lensometer
The ANSI tolerance for a soft lens diameter is
±0.25
The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D
±0.18
The ANSI tolerance for RGP Base Curve is
±0.05mm
The ANSI tolerance for RGP lens diameter is
±0.05mm
Which instrument allows simultaneous verification of lens diameter, optic zone
width, and peripheral curve
Radiuscope
Which instrument is best to observe the blends of rigid contact lens
Profile Analyzer
If a toric lens rotates to the fitters left
Add the degrees of rotation to the prescribed axis
If a toric lens rotates to the fitters right
Subtract (minus) the degrees of rotation to the prescribed axis
Increasing the sagittal depth of a rigid lens will
Not change the effective power of the lens
How would you stop rotation in a bifocal lens
Truncate the lens
Change the base curve
Increase prism
The DK value of a lens is
Oxygen permeability of that material
The original rigid material used in contact lens manufacturing
Polymethylmethacrylate (PMMA)
Orthokeratology may be defined as
Reduction of refractive errors by corneal molding with the contact lens applications
What can be used to evaluate a dry eye patient
solution
Steep Fluorescein Pattern
Bright green pooling center, very faint green pooling on diameter of lens
Flat Fluorescein Pattern
Bright green pooling on diameter of lens, very faint green in center
Against-the-rule Astigmatism Pattern
Bright green pooling horizontally, faint green pooling vertically
With-the-rule Astigmatism Pattern
Bright green pooling vertically, faint green pooling horizontally
Prism Ballast
Common technique to stabilize lens from rotating. Added thickness will position lens
inferiorly (bottom of cornea)
Truncation
Cutting off .50mm to 1.50mm of bottom edge of lens to provide stability. Reduces
diameter, making a looser fit.
Double Slab-off
Lens is thicker centrally and thinner at top and bottom of lens. Provides comfort to
wearer, but may cause some stability issues.
Aspheric Lens Design
Hyperflange
Used to correct high riding minus lenses.
Myoflange
Used to correct low riding plus lenses.
Monovision
Corrects presbyopia in contact wearers. One eye uses distance (dominant) and the
other eye uses reading (resessive)
Segment Bifocal
Same concept as spectacle bifocal. Must be prism ballast. Often crescent shaped.
Toric Lenses
Anterior (front surface), back spherical surface or posterior (back surface), toric back
curve
Front Toric Lens
Corrects a low to moderate amount of corneal astigmatism
Back Toric Lens
Corrects a mid to high amount of corneal astigmatism
Bitoric Lens
Corrects 1.50D of corneal astigmatism and high residual astigmatism
Aphakic
Condition of no crystalline lens
Psuedophakic
Implant, intraocular lens
Corneal Edema
Always causes a poor fitting lens
, Spectacle Blur
Temporary blurred vision upon switching from contact lenses to eyeglasses
Crystalline Lens
The main focusing mechanism of the eye
The Main Supply of Oxygen to the cornea is provided by
Tear Film
Keratometry mires which are only clear when the wearer blinks are indicative of a
Steep Fit
Keratometry mires which blur immediately following blink are indicative of a
Flat Fit
A rigid contact lens shows a flourescein pattern inferiorly and superiorly beneath
the lens. This is indicative of which type of astigmatism
With-the-rule
A bi-toric rigid lens will show
Two base curves on the radiuscope, sphero-cylindrical rx on the lensometer
The ANSI tolerance for a soft lens diameter is
±0.25
The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D
±0.18
The ANSI tolerance for RGP Base Curve is
±0.05mm
The ANSI tolerance for RGP lens diameter is
±0.05mm
Which instrument allows simultaneous verification of lens diameter, optic zone
width, and peripheral curve
Radiuscope
Which instrument is best to observe the blends of rigid contact lens
Profile Analyzer
If a toric lens rotates to the fitters left
Add the degrees of rotation to the prescribed axis
If a toric lens rotates to the fitters right
Subtract (minus) the degrees of rotation to the prescribed axis
Increasing the sagittal depth of a rigid lens will
Not change the effective power of the lens
How would you stop rotation in a bifocal lens
Truncate the lens
Change the base curve
Increase prism
The DK value of a lens is
Oxygen permeability of that material
The original rigid material used in contact lens manufacturing
Polymethylmethacrylate (PMMA)
Orthokeratology may be defined as
Reduction of refractive errors by corneal molding with the contact lens applications
What can be used to evaluate a dry eye patient
