NCLE REVIEW NAO QUESTIONS WITH COMPLETE
SOLUTIONS
Biggest disadvantage of PMMA material is its lack of - Correct Answer Gas permeability Layer that makes up 10% of the cornea - Correct Answer Epithelium Vertical measurement for palpebral fissure - Correct Answer 15mm Eyelid muscle responsible for lid closure - Correct Answer Orbicularis oculi
A dense opacity of the cornea is called a: - Correct Answer leukoma
Goblet cells that secrete that secrete mucous into tear film are located in which structure - Correct Answer Conjunctiva Transition zone between the bulbar conjunctiva and the palpebral conjunctiva is called - Correct Answer fornix Middle layer of the globe is mostly responsible for - Correct Answer Nutrition Pupillary constriction is called - Correct Answer miosis Bactericidal ingredient found in the precorneal tear film is - Correct Answer Lysozyme The cornea is clear, and must remain clear, which means it must be ______, and be free from ______. - Correct Answer avascular, scarring what are tarsal plates? - Correct Answer two thin, elongated plates of dense connective tissue, about 2.5cm in length. Contributes to it's form and support.what is a prism ballast? - Correct Answer prismatic shape used in contact lens to stabilize the lens by preventing rotation 1 / 2
how does one achieve the rotational control of truncation? - Correct Answer by making the bottom edge of the lens flat what are principal meridians? - Correct Answer the meridians of most and least curvature, or greatest and least power on a cylindrical or toric surface what is a bicurve lens? - Correct Answer lens consisting of two posterior curvatures; one central curve(base curve) and one peripheral curve a soft lens should have a curve and diameter that will allow it to drape the cornea, vault over the limbus, and extend how many mm into the sclera? - Correct Answer 1mm what angle identifies the smallest angle? - Correct Answer minimum visual angle if the diameter is kept constant and the base curve is changed, the sagittal depth of the lens changes.How steep is the base curve, how large is the sag, and how steep is the fit? - Correct Answer steeper the base curve, the larger the sag and the steeper the fit given the K's 42.00@180/42.50@90, a manifest Rx of -1.00-.50x180, and your patient wanting to wear his lenses only on the weekends, which type of lens would you suggest? - Correct Answer soft spherical describe the axial edge lift - Correct Answer the vertical distance from the lens edge to an extension of the base curve of a lens what is apical bearing or apical touch - Correct Answer posterior lens curvature resting on the corneal apex what is an interpalpebral fit? - Correct Answer a well centered rigid lens that fits between the upper and lower eyelids, where the upper lid does not control the position of the lens.in fitting a contact lens, if the fitter fits a lens on "K", what does that mean? - Correct Answer the lenses are fitted to parallel the flatter meridian of the cornea What is fenestration? - Correct Answer tiny hole in a contact lens, made to enhance the transmission of tears and oxygen through the lens material
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