NCLE Practice Test

NCLE Practice Test A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - a)-4.50 +1.00 x75 When a keratometer is being calibrated, which of the following targets will provide the most reliable result? a)the single-cut anterior surface of a high-plus lens b)a perfectly flat highly polished mirror c) a set of steell balls of known radii d)the unfinished posterior surface of a low-minus lens - c) a set of steel balls of known radii Inadequate movement of a soft lens can be corrected by using a lens that a) has a steeper base curve b) has a smaller diameter c) has a larger diameter d) has a higher water content - b)has a smaller diameter A long-term, successful, hydrogel contact lens wearer suddenly develops dry eyes. Which of the following is most likely to cause this problem? a) Use of oxidative solution b) use of rewetting drops c) use of anti-histamines d) Wearing of lenses in the wrong eyes - c) use of anti-histamines During slit-lamp evaluation, on upward gaze, a patient's soft contact lenses move 0.5 to 1mm when the patient blinks. These lenses are: a) a good fit b) too loose c) too tight d) too large - a) a good fit A new daily wearer of soft lenses returns for the first follow up visit with itching, burning, injected eyes. The most likely cause of these problems is: a) solution reaction b) giant-cell papillary conjunctivitis c) a lens fit that is too loose d) inability to wear soft lenses - a) solution reaction Which of the following is the mode of slit-lamp illumination used to view the early stages of microcystic edema? a) Retroillumination b) Direct illumination c) Parrallelpiped d) Oscillation - a) Retroillumination Which of the following changes is best able to improve oxygen transmissibility to a patient's cornea? a) Increasing tear exchange b) Increasing Dk c) Increasing optical zone diameter d) Increasing CN bevel - b) Increasing Dk In using fluorescein to evaluate the fit of a rigid lens of 9.0mm