NCLE Practice Test Practical Questions and Answers with Certified Solutions

NCLE Practice Test Practical Questions and Answers with Certified Solutions 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