NCLE Test review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| This Test Measures Quality of the Tears | B.U.T TEST (Break Up Time)
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| What is the O2 Permeability | DK Value of a lens
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| What are the Disadvantages of Soft Lenses | Doesn't correct Irregular Astigmatism Favors Deposit formation
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| For succesful contact lens wear, EOP should be at least | 7%
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| This test Measures the Quantity of the Tears | The Schirmer Test Good result is 15mm in 5 minutes Dry eye is 5 to 10mm in 5 minutes
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| Neovascularization is mainly due to what | Hypoxia, Corneal Edema, Tight Contact lens Fit
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| the Radii and Power of an average Cornea | 7.85 mm or +43.00D
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| what are the Layers of the Cornea | Epithelium, Bowmans' Layer, Stroma, Descemet's Membrane, Endothelium
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| The Main Disadvantage of Soft contact lenses | Protein Deposits
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| What is it when we use Contact Lenses to Correct high Myopia | Orthokeratology (Ortho-K)
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| A Contact Lens with diameter that is larger than the Cornea is a Hydrophobic or Hydrophilic | Hydrophilic
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| Which of the following Curves, indicates the flattest Base Curve 7.50mm, 37.50 D, 8.60mm, 49.00 D | 37.50 D
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| A CTL was ordered with a BC of 7.85mm but was received from the lab with a BC of 7.80mm. The BC of the actual lens is | 0.25D steeper than the ordered CTL
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| a CTL with BC of 7.42mm is fitting too loose, a tighter fit may be achieved by changing the base curve to: 7.46mm , 7.85mm , 8.04mm , None of these | None of these.... S.S.S Rule
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| A CTL has a BC of 7.50mm, what would the PPC most likely be? 7.45mm , 42.50D , 7.35mm , 30.00D | 30.00D = 11.25mm / S.S.S Rule
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| What does the Term Haptic Lens refer to? | A Scleral CTL Size
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| The Secondary Curve of a RGP CTL is Generally Flatter or Steeper than the CPC and by How much? | Flatter by 2 to 4 Diopters
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| When the Power of a curve changes by 0.50D , the radius of the Curvature Changes by approximately how much? | 0.10mm
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| The CPC of a CTL measures 7.5mm Radius, how much is the Power in Diopters? | 45.00D
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| A soft CTL demonstrates excessive movement. This can be fixed with a Lens that has a ______________ Diameter? | Larger Diameter. (Larger Diameter = Steeper Fit = Tighter Fit)
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| HEMA is an Abbreviation commonly used to describe what Lens? | the Chemical name for Soft CTL
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| what is the main reason to utilize a Ballasted CTL? | to have less Rotation of the CTL (usually used in bifocal CTL's)
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| The Central portion of the Back surface of the CTL is called? | CPC (Central Posterior Curve) or the Base Curve (BC) or the Optic Zone
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| The Distance between a Flat Surface and the Back surface of the Central Portion of a Lens is called the................ | Sagital Depth ( Vault, height)
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| A loose fitting CTL can be made to fit tighter by ___________ the Radius of the CPC. | Shortening the radius of the CPC. S.S.S Rule
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| what is an example of a Hydrophilic Lens Material? | HEMA
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| A Contact Lens in which the anterior surface contains 2 different radii of Curvature and the Posterior surface is Spherical curve is called a ................... | Front surface Toric
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| The Central Portion of a CTL which contains the refractive power of the CTL is the ...... | Optic Zone (OZ)
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| A CTL which contains 2 curves, One BC and One Secondary Curve. | Bicurve CTL
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| The Smoothing of the junction zones by removing the sharp line between the zones is...... | Blending of the curves
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| The measurement from one edge of the lens to the opposite edge is........ | Chord Diameter
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| A lens which has been cut off to form a horizontal base which improves stabilazations....... | Truncated Lens
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| the effective power of a lens when measured from the back surface....... | BVP Back vertex power...
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| wetting angle means..... | the angle that the edge of bead of water makes with the surface of the plastic... the smaller the angle, the greater the wetting ability
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| A lens in which the anterior surface has two different radii and the posterior surface is spherical.... | Front Surface Toric Lenses
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| A Lens in which both the posterior surface has two different radii and the anterior surface has two different radii is........ | Bi-Toric
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| A lens design generallly used in higher plus powers which consists of a central optic zone and a surrounding non-optic peripheral or carreir portion is.... | Lenticular Bowl
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| a method of manufacturing soft contact lenses whereby a liquid material is revolved in a mold at a controlled speed and temperature which produces the desired curvature, design, and power....... | Spin-Cast lenses
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| When we add 50% of the Cylinder to the sphere and determine a Spherical Prescription it's called...... | Spherical Equivelant
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| The Tear Film Layers from inside out are.... | Mucin, Aqueous, Lipid
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| This Tear Film layer will change the corneal surface from an Hydrophobic surface to a Hydrophilic Surface..... | Mucin Layer
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| The Lipid Layer has a Primary function of..... | Preventing Evaporation of the Tears
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| what age group has the best prognosis for successful Contact Lens Fitting........ | 13-38
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| When moved 5mm from it's original position the effective power of a 10.00 D lens will change by........... | 0.50D
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| when do we consider vertex distance compensation for Spectacles and for CTL's? | Spectacles 7.00D CTL's 4.00D
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| Spectacle Lens is Prescribed at -10.00D, if the lens fit is at a vertex distance of 10mm, an RGP ctl fit on K will require a power of how much? | -9.00D Minus Lens Coming Closer Gains Power
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| RX -4.00+1.00x90 K: 42.50@180/43.50@90 RGP CTL fit on K has a power of......... | -3.00DS
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| +11.00+1.00x20 VD = 12mm K: 46.25/47.25 What's the power of RGP lens fitted on K | +13.00D +13.25D +13.50D all are correct... NCLE will say +13.00D
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| -3.00-0.50x90 VD = 11 What's the RGP CTL power fit 0.50D steeper than the flattest corneal merridian? | -3.50D VD doesn't matter since rx is less than 4.00D
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| -2.50+0.25x90 VD = 12mm power of CTL if fit 0.75 steeper than K.... | -3.00D
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| The CPC of a trial CTL is 44.00D and contains a power equal to +14.87D. The over refraction is equal to -1.62D. What is the Final CTL Rx if the CPC to be ordred is 43.62D.... | +13.63D (LLP= +0.38D)
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| A -3.50D Lens with a base curve of 44.50D provides excellent visual acuity. if the CPC were changed to 45.00D what power would be needed? | -3.00D (LLP = -0.50D)
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| a Dry Eye condition can be evaluated with a test called........ | Schirmer Test
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| RX -3.25D-1.00x180 K = 44.25@180 / 45.25@90 Vertex Distance 12mm what is the power of RGP CTL fitting 0.50D Flatter than K | -2.75D
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| How do you assess the quality of the peripheral curves of a RGP lens? | using a Shadowgraph
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| Patient is wearing a RGP lens in the right eye, it has a power of +3.00D and a base curve of 43.25. if the Dr Refracts -0.50D sphere over this lens and a new lens is to be ordered with a BC of 43.00, what will the new power need to be? | +2.75D
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| the optic zone of a RGP lens can be measured with ....... | Radiouscope
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| An Enzyme contained in the precorneal tear film that protects the cornea from infections is.......... | Lysozyme
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| The layer of the precorneal tear film responsible for exchange of materials across the corneal surface is the | Aqueous Layer
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| how many layers does the cornea have? | 5 Layers
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| The average central thickness of the Cornea is....... | 0.56mm
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| the corneal epithelium obtains oxygen from the ....... | Precorneal Tear Film
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| The thickest layer of the cornea is the...... | Stroma
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| the corneal layer primarily responsible for maintaining the Cornea in a partially hydrated state..... | Endothelium
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| the Descemet's membrane of the cornea is produced by which layer of the cornea..... | Endothelium
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| Sever damage to the corneal endothelium results in what. | Corneal Edema
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| A tightly fitted soft contact lens can cause....... | Corneal Edema
Limbal Compression
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| The Sclera of the eye is covered by what.... | Bulbar Conjunctiva
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| New blood vessels that grow into the cornea originate from blood vessels that are located in ......... | the Limbus
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| Obstruction of the flow of aqueous humor out of the anterior chamber results in... | Elevated Intra Ocular Pressure
(Glaucoma)
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| a condition where the Iris or portions of the Iris in absent is called | Aniridia
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| the curvature of the central portion of the back surface of a contact lens is the...... | Base Curve
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| the central zone of a contact lens that contains the refractive power of the contact lens is the..... | Optic Zone
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| The measurement from one edge of a contact lens to the opposite edge is the..... | Chord Diameter
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| The base curve of a contact lens is also known as the ..... | CPC (Central Posterior Curve)
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| The Peripheral Posterior Curve of a bicurve Contact Lens is Steeper or Flatter than the CPC | Flatter
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| what happens to the sagital vault of the contact lens when a contact lens is steepened...? | it increases
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| shortening the base curve radius of a contact lens makes the lens steeper of flatter? | steeper
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| the problem of a loosely fitting contact lens can be solved by ordering a new contact lens having a ....................... Base Curve | Shorter (SSS)
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| Increasing the overall Diameter of a contact lens makes the lens steeper of flatter? | Steeper
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| The Effective power of a contact lens measured from the back surface is the............... | Back Vertex Power
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| This Contact lens has 2 different Radii on the anterior surface and a Spheric Posterior curve. It's used to correct Residual Astigmatism..... | Front Toric Contact Lens
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| When correcting Large amounts of Corneal Astigmatism a Toric lens must be used that is a ................. Toric. (Front/Back) | Back Toric
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| A contact lens that is used to correct both Corneal and Residual Astigmatism is ................ | Bi-Toric
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| A Contact lens with a thickened inferior edge that stabilizes the contact lens is called a............ | Prism Ballasted Contact Lens
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| A CTL that is Cut off inferiorly so the lower eyelid can help to stabilize the contact lens is called a ........... | Truncated CTL
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| A CTL that has a low wetting Angle has ............ Wettability | Good Wettability
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| Decreasing the overall diameter of a CTL will loosen or tighten the fit | Loosen the fit
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| A CTL having a BC radius of 7.94 mm fits too loosely, a tighter fitting CTL will have which one of the following BC.... (7.99 / 7.85) | 7.85 mm
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| a CTL having an overall diameter of 9.5mm fits too tightly, a looser ctl will have which diameter....... (9.6 / 9.3) | 9.3 mm
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| an instrument that's used to measure Corneal Astigmatism is..... | Keratometer
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| When the Vertical Corneal meridian is steeper than the Horizontal Corneal Meridian, the corneal astigmatism is...... | WTR With the Rule Astigmatism
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| Concerning measurements of Corneal Curvatures, the longer the mm of Radius the Larger of Smaller the Diopter value....? | Smaller (SSS Rule)
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| a CTL material having a large wetting angle is Hydrophobic or Hydrophilic? | Hydrophobic
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| A Lab Measurement of the Oxygen permeability of a RGP CTL is called...... | DK Value
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| A measurement of the Oxygen Transmissibility of a RGP CTL is called ........ | DK/L
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| The Greater the Central Thickness of a CTL the more of less Oxygen transmissibility?..... | Less
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| What is EOP? | Equivalent Oxygen Performance or Percentage
Measures how much Oxygen actually reaches the Cornea while wearing CTL
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| A CTL designed with a peripheral carrier or Flange having no power and a Central Power Zone is called a ................ CTL | Lenticular Design
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| Is the Following K reading With the rule or against the rule astigmatism?.... 43.00@180/44.00@90 | With The Rule (more at 90)
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| The K-reading of the horizontal meridian of a cornea is 48.00, this is what mm of radius? | 7.03 mm (337.5 Rule)
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| Vertex Distance must be considered in determining CTL power if the Spectacle Rx is over................ D | +/- 4.00D
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| the BC of a rigid CTL sitting on a cornea is flatter than the corneal curvature. Therefore the Lacrimal Lens power is....... (plus/Minus) | Minus
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| the best type of slit lamp illumination to use for detecting gross corneal edema is called...... | Sclerotic Scatter
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| the type of slit lamp illumination that is used primarily for a general survey of the external eye is called...... | Diffuse Illumination
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| the type of slit lamp illumination that is useful for inspecting the anterior surface of a contact lens is called the....... | Direct Focal Illumination
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| if a person wanting CTLs has Blepharitis, you should do what? | refer them to the prescribing Doctor
any type of "ITIS" has to go back to the DR.
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| where is the Giant Papillary Conjunctivitis Located?.... | on the Tarsal Plate of the Upper eyelid margin
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| a test used to assess the quality of the precorneal tear film is called the...... | BUT test ( Break Up Time)
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| Polymegathism of the corneal endothelium is thought to be due to ....... | Corneal Hypoxia
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| the type of slit lamp illumination used to observe Cells and flare in the anterior chamber of the eye is......... | Conical Beam Illumination
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| the type of slit lamp illumination that is the method of choice for examination of microcystic epithelial edema of the cornea is called.... | Retro Illumination
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| The best type of Slit Lamp illumination for studying the corneal endothelium is ...... | Specular Reflection
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| the Slit lamp light that passes through a cobalt blue filter can be used to observe.......... | Corneal Staining
the Fit of the Contact Lens
Corneal Dry spots
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| a Soft CTL case should be thoroughly cleaned at least........ | once per week
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| a Person with Scleral Show requires a (large/small) Diameter soft CTL? | Large Diameter Soft CTL
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| Preservatives in Contact Lens Solutions can cause .......... | Photophobia
Corneal Staining
Excess Tearing
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| What can occur during an allergic reaction to a CTL solution..... | Itching
Conjunctival Redness
Conjunctival Chemosis (Swelling)
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| True/False Corneal Sensation is reduced in an Aphakic Eye. | True
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| Giant Papillary Conjunctivitis occurs more frequently in people who wear what type of lenses.... | Soft Hydrogel lenses
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| wearing standard thickness soft CTL's longer than 12 hours per day for a prolonged period of time can cause............ | An increase in the steepening of the cornea
Development of irregular astigmatism
Permanent form of acquired Keratoconus
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| Limbal Compression is a sign of (loose - tight) fitted ctl | Tightly fitting CTL
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| an eye has a Spectacle Rx of -3.00-0.25X180. This eye should be fit with a soft CTL having a power of................ | -3.00 D (1/3 Rule)
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| an eye has a spectacle rx of -3.25-0.50X180. This eye should be fit with a hydrogel CTL having a power of........... | -3.25 D (1/3 Rule)
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| an eye has a spectacle Rx of -4.00+1.00X180. this eye should be fit with a hydrogel CTL having a power of........... | -3.50 D (1/3 Rule)
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| An eye has a spectacle Rx of -6.50+1.00X090. the K readings are 42.00@180/43.00@90. The Vertex Distance is 12mm. This eye should be fit with Soft CTL RX of,,,,,,,,,,,,,,,,,,,,,, | -5.25 D (1/3 Rule + 10.10.1 Rule)
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| what are characteristics of PMMA CTL's...... | Good Stability
Good Optics
Acceptable Wettability
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| which of the following CTL materials has the highest Oxygen Permeability.. (HEMA, PMMA, ACRYLATE, SILICONE) | Silicone
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| The water content of hydrogel contact lenses varies from.......... | 25% to 85%
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| The higher the Water Content of a Hydrogel CTL the.................... the Oxygen Transmissibility. | Greater
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| Hydrogel CTL are made of what material. | HEMA
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| Tears drain into the ........... | Punctum
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| During a blink the lower eyelid moves primarily towards the...... | Nose
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| The Muscle responsible for elevation of the upper eyelid is the........ | Levator Palpebrae
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| the PH of the Pre-corneal tear Film is...... | 7.35
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| the layer of the pre corneal tear film that is responsible for exchange of materials across the corneal surface is the........ | Aqueous Layer
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| The Function of the Eyelids are......... | Limit the amount of light entering the eye
Protect the eye from external irritation
Distribute Tears over the surface of the eye.
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| The opening of the Meibomian glands are found on the...... | Eyelid Margin
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| the Meibomian Glands are located in the......... | Tarsal Plate.
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| an Acute infection of the Meibomian Glands is called..... | an internal Hordeolum
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| with spontaneous blinking, the normal blinking rate is...... | 12-18 per minute
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| the pre-corneal tear film is composed of how many layers....... | 3 Lipid, Aqueous, Mucus
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| with basic tear secretion, the aqueous tear film layer is secreted by the.............. | Glands of Wolfring and Krause
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| the pre-corneal tear film layer that changes the hydrophobic surface of the cornea to a hydrophilic surface is the .............. | Mucous Layer...
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| the pre-corneal tear film layer that reduces the rate of tear evaporation is the.......... | Lipid layer (oily)
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| The mucous layer of the pre corneal tear film is secreted by the..... | Conjuntival Goblet Cells.
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| The Lipid Layer of the Precorneal tear film is secreted from......... | the Meibomian Glands
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| A spherical PMMA CTL should be fit so that there is a slight............... | Apical Clearance
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| When fitting PMMA CTL, the CTL diameter can be calculated by adding 4 mm to the | Pupilary Diameter
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| A high minus RGP CTL should have .........(+/-) Carrier Lenticular Lenses. | Plus Carrier Lenticular Lens. Hyperflange
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| the quality of fit of a RGP CTL can be assessed with the use of........ | Fluorescein
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| Rigid CTL's can be modified in the office to become Steeper. (true-False) | False.
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| what solution improves the wettability of Rigid CTL's..... | Wetting Solution
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| if a rigid CTL on an eye is too steep the fluorescein pattern will show....... | Central Pooling
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| if a rigid CTL on an eye is too flat the fluorescein pattern will show....... | Central Touch
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| the size of the entire corneal cap can be measured with the.... | Topogometer
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