POST TEST FOR MODULE 43:  The Anterior Segment, Part 1, The Tear Film and the Cornea       Catalog

                                                                   

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1. The refractive power of the cornea is about:

A. 6.2 diopters

B. 62 diopters

C. 42 diopters

D. 4.2 millimeters

2. The shape of the cornea is aspherical (read carefully, this is not "spherical"), meaning that:

A. it is shaped like a sphere

B. it is steeper at the center than it is at the edge

C. the diameter is larger horizontally than it is vertically

D. the diameter is larger vertically than it is horizontally

3. Which factors contribute to the clarity of the cornea?

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

4. Which is not one of the five layers of the cornea?

A. epithelium

B. Bowman's membrane

C. Descarte's membrane

D. endothelium

5. Which is the outermost layer of the tear film?

A. aqueous

B. lipid

C. mucin

D. epithelium

6. Which instrument is used to examine and count the endothelial cells?

A. keratometer

B. pachymeter

C. topographer

D. specular microscope

7. Corneal thickness can affect the accuracy of:

A. applanation tonometry

B. schiotz tonometry

C. endothelial cell counts

D. keratometry

8. Which is not a type of corneal dystrophy?

A. Keratoconus

B. Cogan's

C. Fusarium

D. Fuch's

9. Which is not a manifestation of keratoconus?

A. scissors retinoscopy reflex

B. decreasing vision

C. flattening of the cornea

D. increased astigmatism

10. Exposure keratitis can result from welding without eye protection.

A. True

B. False

11. Which will work best to improve the vision of an eye with irregular astigmatism?

A. Lasik

B. rigid gas permeable contact lens

C. toric soft contact lens

D. glasses

12. Keratoplasty is:

A. replacing diseased corneal tissue with healthy corneal tissue from a cadaver eye

B. replacing diseased corneal tissue with a synthetic substance

C. reshaping the cornea with a laser

D. cutting out diseased corneal tissue so new tissue can grow back

13. Which is not likely to make a dry eye condition worse?

A. high humidity

B. taking an antihistamine

C. exposure to wind

D. wearing a high water content soft contact lens

14. "SPK" is revealed by:

A. tear break up testing

B. Schirmer testing

C. rose bengal staining

D. fluorescein staining

15. Which is true of punctal occlusion?

A. It is used to improve drainage of tears.

B. It is used to permanently block the drainage of tears to improve lubrication of the eye.

C. It involves a small disk that slowly releases lubrication to the eye.

D. It involves a small plastic plug.