NCLE Practice Test Practical Questions and Answers (Graded A+)

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) Truncation - ANSWER-Cutting off .50mm to 1.50mm of bottom edge of lens to provide stability. Reduces diameter, making a looser fit. Double Slab-off - 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 - ANSWER- Hyperflange - ANSWER-Used to correct high riding minus lenses. Myoflange - ANSWER-Used to correct low riding plus lenses. Monovision - ANSWER-Corrects presbyopia in contact wearers. One eye uses distance (dominant) and the other eye uses reading (resessive) Segment Bifocal - ANSWER-Same concept as spectacle bifocal. Must be prism ballast. Often crescent shaped.