Ncle Test - Questions And Verified Solutions

The pre-corneal tear film is composed of three distinct layers. They are: a. Lysozyme, oil, lacrimal b. Sebacious, mucoid, BAK c. lipid, lacrimal, mucin d. water, mucoid, lysozyme {Ans: c. lipid, lacrimal, mucin}A rigid lens showing apical vaulting is an indication of a. steep fit b. an alignment fit c. a flat fit d. an astigmatic fit {Ans: a. steep fit}A lens fitted for keratoconus should: a. Flatten the apex b. Ride high c. Align the apex d. Ride low {Ans: c. Align the apex}Which of the following can NOT be used to measure the diameter of a rigid lens? a. profile analyzer b. measuring magnifier c. diameter gauge d. shadowgraph {Ans: a. profile analyzer}The CPC of a rigid lens was ordered 7.84mm and was received measuring 7.94mm. This lens is _____ than ordered. a. 0.50D steeper b. 1.00D flatter c. 0.50 flatter d. 1.00D steeper {Ans: c. 0.50 flatter}Refractive Rx -3.00 -1.00 x 170 K's 42.00 @ 170/43.00 @ 80 Given the above Rx and K's he following diagnostic toric soft lens was used: B.C. 8.8 Power -3.00 -1.00 x 180 During dianostic evalutation, the above lens rotated 10 clockwise. The lens ordered should