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35 Cards in this Set
- Front
- Back
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Which factors contribute to the clarity of the cornea?
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A. there are no blood vessels in the cornea
B. the nerves in the cornea are demyelinated C. the corneal tissue is relatively hydrated D. A and B *** |
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Corneal diameter is used in contact lens fitting and insertion ofanterior chamber IOLs. The average corneal diameter is:
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12mm
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Which instrument is used to examine and count the endothelial cells?
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specular microscope
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Which is not a type of corneal dystrophy?
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A. Keratoconus
B. Cogan's C. Fusarium *** D. Fuch's |
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A viral infection of the cornea that is characterized by a branching dendritic lesion is called:
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herpes simplex keratitis
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Which is the outermost layer of the tear film?
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lipid
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Keratoconus is the term used for an abnormality of the:
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cornea
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A metallic corneal foreign body may cause a __________ which may require the physician to use a(n) ___________.
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rust ring burr
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Which corneal disease manifests itself with a dendritic corneal ulcer that can be made worse with steroid eye drops?
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herpes simplex virus
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Which is the only corneal layer that regenerates and does not leave a scar when injured:
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epithelium
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Corneal thickness can affect the accuracy of:
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applanation tonometry
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"SPK" is revealed by:
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fluorescein staining
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Which of the following is not a source of ultraviolet radiation which may cause a burn injury to the cornea?
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reflected sunlight
incandescent lamps *** sunlamps used for tanning carbon arc lamps welding arc |
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Which is not likely to make a dry eye condition worse?
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high humidity
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The refractive power of the cornea is about:
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42 diopters
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Keratoplasty is:
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replacing diseased corneal tissue with healthy corneal tissue from a cadaver eye
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Evaporation of tears is reduced by oil secreted by:
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meibomian glands
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Exposure keratitis can result from welding without eye protection.
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true
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Which will work best to improve the vision of an eye with irregular astigmatism?
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rigid gas permeable contact lens
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Blood vessels in the cornea:
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indicate disease
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Which layer of the cornea functions as a "pump" keeping the cornea dehydrated?
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endothelium
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The corneal epithelium can regenerate in what period of time?
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24 hours
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Schirmer's test is used to test for:
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dry eyes
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The junction of the cornea and the sclera is called the:
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limbus
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Which is not a layer of the tear film?
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inner lipid
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A foreign body sensation may be caused by which of the following?
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corneal foreign body
a corneal abrasion inflammation affecting the cornea A and B all of the above *** |
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Defects in the corneal epithelium will be revealed with the use of:
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fluorescein
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The shape of the cornea is aspherical (read carefully, this is not "spherical"), meaning that:
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it is steeper at the center than it is at the edge
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Most superficial corneal injuries will heal in a period of:
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24 hours
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Tear production is measured by which test?
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Schirmer
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Which is not a manifestation of keratoconus?
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A. scissors retinoscopy reflex
B. decreasing vision C. flattening of the cornea *** D. increased astigmatism |
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The front surface of the cornea has which of the following shapes?
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convex
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Which is not one of the five layers of the cornea?
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A. epithelium
B. Bowman's membrane C. Descarte's membrane *** D. endothelium |
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Which is the outermost layer of the cornea?
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epithelium
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Specular microscopy is used to count the number of cells in which layer of the cornea?
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endothelium
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