NCLE Test Review Questions & Answers 100% Correct.

Test that measures the quality of tears - ANSWER-B.U.T. Test (Break up time) What is the O2 Permeability - ANSWER-DK values of a lens What are the disadvantages of Soft Lenses? - ANSWER-Doesn't correct irregular astigmatism, favors deposit formation Which test measures the quantity of tears? - ANSWER-The Schirmer test. What are good results for the Schirmer test? - ANSWER-15 mm in 5 minutes. What are dry eye results for the Schirmer test? - ANSWER-5-10 mm in 5 minutes. Neovascularization is mainly due to what? - ANSWER-Hypoxia, corneal edema, tight contact lens fit The Radii and Power of an average cornea - ANSWER-7.85 mm or 43.00 D What are the layers of the cornea? - ANSWER-Epithelium, Bowman's membrane, Stroma, Descemet's membrane, Endothelium The main disadvantage of soft contact lenses - ANSWER-Protein deposits What is it called when contact lenses are used to correct high myopia? - ANSWER-Orthokeratology (Ortho-K) A contact lens with diameter that is larger than the cornea is a hydrophobic or hydrophilic lens? - ANSWER-Hydrophilic lens Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D, 8.60 mm, 49.00 D? - ANSWER-37.50 D A CTL was ordered with a BC of 7.85 mm but was received from the lab with a BC of 7.80 mm. The BC of the actual lens is _____. - ANSWER-.25 D steeper than the ordered CTL.