NCLE Review Questions And Answers

DK/L Stands for: a. oxygen permeability, b. thermal conduction, c. oxygen transmissibility, d. wettability - Answer- C. Oxygen Transmissibility A prism ballast, trunctated lens is on a left eye. The cylinder axis is 90 degrees. Prism base is noted to rotate 15 ddegrees nasally. What cylinder axis shoud be ordered to compensate for the rotation? a. 95, b. 105, c. 110, d. 75, e. 80 - Answer- B. 105 Small superficial linear stains are characteristic of? a. foreign particles under the lens, b. poor insertion, c. exposure, d. unblemded peripheral curves, e. flat lens corneal relationship - Answer- A. Foreign particles under the lens A patient has the following prescription: OD -4.50 -2.00 x 010 "k" 44.25@10/46.25@100 A trial lens of -2.00 -1.75 x 020 is placed on the eye. Using a -1.25 OR and the base pivots 10 degrees nasal, which lens should be ordered? a. -3.25 -1.75 x 010, b. -3.25 -1.75 x 180, c. -3.25 -1.75 x 020, d. -3.25 -1.75 x 030 - Answer- B. -3.25 -1.75 x 180 Diffuse corneal stippling observed during a routine 6 month follow up visit is most likely due to: a. microcystic edema, b. posterior surface deposits, c. warped lens, d. gross edema, e. incorrect power - Answer- B. Posterior surface deposits Arc staining is observed during a routine follow up visit is most likely due to: a. microcyst edema, b. posterior surface deposits, c. improper recentering technique, d. gross edema, e. incorrect power - Answer- C. Improper recentering technique A flourescein pattern which shows a touch apperance in the horizontal meridian and a brighter green in the vertical meridian indicates that the patient has: a. against the rule astigmatism, b. residual astigmatism, c. with the rule astigmatism, d. oblique astigmatism - Answer- C. With the rule astigmatism The advantage of fluorocarbon materials include: a. wettability, b. deposit resistance, c. oxygen transmissibility, d. the use of larger lens diameters, e. all of the above - Answer- E. All the above If a patient has reduced acuity and a gas permeable lens is found to flex on the eye, which lens modifications are available to the fitter? a. larger diameter, b. steeper base curve, c. flatten base curve, d. thicker lens, e. c and d - Answer- E.