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Health Care > EXAM > NCLE basic Exam kit| 360 QUESTIONS| WITH COMPLETE SOLUTIONS (All)

NCLE basic Exam kit| 360 QUESTIONS| WITH COMPLETE SOLUTIONS

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What is the Secondary/intermediate curve? Correct Answer: The curve on the posterior side of the contact lense between the base curve and peripheral curve. Usually 0.7mm to 1.6mm flatter than the base curve radius. The width is affected by the OZ diameter and peripheral width. What is the peripheral curve? Correct Answer: The outermost curve on the posterior side of the contact lens. It clears the flatter periphery and prevents lens impingement in the limbal areas What measurements effect the size of the peripheral curve? Correct Answer: The radius of curvature and width. Smaller diameter = steeper radius of curve Larger diameter = flatter radius of curve What is a blend curve? Correct Answer: A treatment given to sharp junctions caused by differences in radii of curvature. Mostly required between secondary and peripheral curve. Blended curve = secondary and peripheral average What is the diameter of the contact? Average diameter of an RGP lens? Correct Answer: The overall width of lenses from end to end in mm. RGP average is 7mm to 10.5mm What is the anterior optical zone radius of curvature Correct Answer: The radius of curvature of the front surface. It determines the refractive power of the lens. Has both a radius and diameter. How do you determine the lens power? Correct Answer: The difference between the radio of anterior and posterior surfaces. Anterior - posterior What is the base curve? Correct Answer: The radius of curvature of the central posterior surface of contact lenses. Measures in diopters or mm What is the OZ? Correct Answer: The diameter of the base curve on the posterior of the contact lens in mm What is a lenticular flange? Correct Answer: An increase or decrease in anterior edge thickness to change the lens mass or help with the positioning What is the myoflange design? Correct Answer: An increase in anterior edge thickness that aids in better centering lenses that sit low on the cornea. Thicker = more kid interaction. The upper lid holds the lens higher

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