NCLE Practice Test Optometry Questions And Answers

NCLE Practice Test Optometry 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 diameter on a typical eye, a correct statement is that: a) apical touch with pooling in the PPC curve area is preferred b) apical toxicity may not be obvious c) apical pooling with edge touch is recommended d) apical area, mid-peripheral area, and the lens edges should be assessed - d) apical area, mid-peripheral area, and the lens edges should be assessed Which of the following changes would improve a rigid contact lens fit that shows sluggish movement after 1 hour of wear? a) Add hyperflange edge treatment b) Reduce overall diameter c) Decrease center thickness d) Increase overall diameter - b) Reduce overall diameter Moving a +7.50 RX from the spectacle plane to the corneal plane will require: a) no change in power b) more minus power c) more plus power d) less plus power - c) more plus power A fluorescein pattern that has a black area over the corneal apex and a diffuse green area in the periphery normally indicates: a) flat fit b) steep fit c) normal fit d) tight fit - a) flat fit IPC's are used to: a) provide a transition between the peripheral and base curves b) reduce edge thickness and lens mass c) increase the optical zone d) smooth the lens edge - a) provide a transition between the peripheral and base curves A toric soft lens with an RX of -2.00 -1.25 x 120 has the axis resting at the 5 o' clock position. What should the new axis be when the lens is ordered? a) 90 degrees b) 105 degrees c) 135 degrees d) 150 degrees - a) 90 degrees Upon initial insertion of a GP lens, the patient complains about flare. To correct this problem, the fitter should choose a lens with a/an: a) increased base curve b) increased optical zone c) decreased optical zone d) flattened base curve - b) increased optical zone Which curve would a fitter modify to allow more tear flow under the edge of a rigid lens? a) Posterior peripheral curve b) Optical curve c) Anterior peripheral curve d) Anterior central curve - a) Posterior peripheral curve If a well fitted diagnostic lens has a -3.00 power and the over-refraction at 12mm is -2.00, the correct lens power to order is: a) -4.50 b) -4.75 c) -5.00 d) -5.25 - c) -5.00 For a patient with 1.25D of with-the-rule astigmatism, who is active outdoors and who operates heavy construction equipment, the most appropriate type of contact lens would be: a) soft toric lenses b) spherical gas permeable lenses c) spherical soft lenses d) toric gas permeable lenses - a) soft toric lenses Which of the following instruments is most commonly used to measure the diameter of the optical zone of a contact lens? a) contactometer b) radiuscope c) measuring magnifyer d) lensometer - c) measuring magnifyer According to the US Food and Drug Administration, the maximum time allowable for continuous wearing of silicone hydrogel lenses is: a) 7 days b) 14 days c) 21 days d) 30 days - d) 30 days When ridig lenses are received from the manufacturer, which of the following instuments is not needed for inspection and verification? a) biomicroscope b) radiuscope c) lensometer d) measuring magnifyer - a) biomicroscope When using a lid manipulation to assist in "popping" a rigid lens off the eye, the wearer should first make sure that the: a) lower lid meets the lower part of the cornea b) lens is resting on the cornea, where the fissure is widest c) edge of the lens has been located with a penlight d) lens is resting on the sclera, where the tissue is widest - b) lens is resting on the cornea, where the fissure is widest