NCLE Practice questions and answers with accurate solutions.

NCLE Practice questions and answers with accurate solutions. Steep Fluorescein Pattern - correct answer.Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - correct answer.Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - correct answer.Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - correct answer.Bright green pooling vertically, faint green pooling horizontally Prism Ballast - correct answer.Common technique to stabilize lens from rotating. Added thickness will position lens inferiorly (bottom of cornea) Truncation - correct answer.Cutting off .50mm to 1.50mm of bottom edge of lens to provide stability. Reduces diameter, making a looser fit. Double Slab-off - correct answer.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 - correct answer. Hyperflange - correct answer.Used to correct high riding minus lenses. Myoflange - correct answer.Used to correct low riding plus lenses. Monovision - correct answer.Corrects presbyopia in contact wearers. One eye uses distance (dominant) and the other eye uses reading (resessive) Segment Bifocal - correct answer.Same concept as spectacle bifocal. Must be prism ballast. Often crescent shaped. Toric Lenses - correct answer.Anterior (front surface), back spherical surface or posterior (back surface), toric back curve Front Toric Lens - correct answer.Corrects a low to moderate amount of corneal astigmatism Back Toric Lens - correct answer.Corrects a mid to high amount of corneal astigmatism Bitoric Lens - correct answer.Corrects 1.50D of corneal astigmatism and high residual astigmatism Aphakic - correct answer.Condition of no crystalline lens Psuedophakic - correct answer.Implant, intraocular lens Corneal Edema - correct answer.Always causes a poor fitting lens Spectacle Blur - correct answer.Temporary blurred vision upon switching from contact lenses to eyeglasses Crystalline Lens - correct answer.The main focusing mechanism of the eye The Main Supply of Oxygen to the cornea is provided by - correct answer.Tear Film Keratometry mires which are only clear when the wearer blinks are indicative of a - correct answer.Steep Fit Keratometry mires which blur immediately following blink are indicative of a - correct 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 - correct answer.With-the-rule A bi-toric rigid lens will show - correct answer.Two base curves on the radiuscope, sphero-cylindrical rx on the lensometer The ANSI tolerance for a soft lens diameter is - correct answer.±0.25 The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D - correct answer.±0.18 The ANSI tolerance for RGP Base Curve is - correct answer.±0.05mm The ANSI tolerance for RGP lens diameter is - correct answer.±0.05mm Which instrument allows simultaneous verification of lens diameter, optic zone width, and peripheral curve - correct answer.Radiuscope Which instrument is best to observe the blends of rigid contact lens - correct answer.Profile Analyzer If a toric lens rotates to the fitters left - correct answer.Add the degrees of rotation to the prescribed axis If a toric lens rotates to the fitters right - correct answer.Subtract (minus) the degrees of rotation to the prescribed axis Increasing the sagittal depth of a rigid lens will - correct answer.Not change the effective power of the lens How would you stop rotation in a bifocal lens - correct answer.Truncate the lens Change the base curve Increase prism The DK value of a lens is - correct answer.Oxygen permeability of that material The original rigid material used in contact lens manufacturing - correct answer.Polymethylmethacrylate (PMMA) Orthokeratology may be defined as - correct answer.Reduction of refractive errors by corneal molding with the contact lens applications What can be used to evaluate a dry eye patient - correct answer.Sodium Flourscein Schirmer Strips Rose Bengal An advantage of a flourocarbon lens is its - correct answer.High DK value Given an Rx of -4.00 + 0.75 x 90 K readings of 43.50@180/44.25@90 a lens designed on K would have an effective sphere power of - correct answer.-3.25 (always remember to transpose to minus format) A protein found in the tear film that is a potent germ killer - correct answer.Lysozyme When trial lens fitting a soft lens patient, after placing the lens on the eye, you should - correct answer.Allow the lens to settle twenty minutes before evaluating Corneal epithelial edema will appear as - correct answer.A grey haze, using a slit lamp with sclerotic scatter and the unaided eye Apical flourescein pooling under a rigid lens indicates - correct answer.A tight fit A dynamic flourescein pattern is best illuminated by - correct answer.Cobalt blue light An "ideal" flouorescein pattern for a spherical lens on a spherical cornea would show - correct answer.An even distribution of flourescein with added thickness under the peripheral curves When a rigid contact lens shows apical touch, this would indicate - correct answer.A flat fit When a spectacle Rx exceeds __________ D, vertex distance must be compensated for when determining the power of a contact lens - correct answer.±4.00 Astigmatism that is left over after a contact lens is placed on the eye - correct answer.Residual Astigmatism Fenestrations are put into a lens to - correct answer.Increase oxygen transmission When the power of a bifocal gradually changes from the central area of the lens to the periphery, it is called - correct answer.An aspheric lens A bifocal design that utilizes a small central reading area and a distance periphery is - correct answer.Reverese Centrad In the manufacturing process, when there is a polished front curve, a polished back curve and a diameter, it is - correct answer.Semi-finished lens Back toric lens works with - correct answer.High corneal toricity Single Cut aphakic contact lenses can be well suited for patients with - correct apertures and flat corneas