The nurse is performing an external eye examination. Which ...

[j.rubin]

The nurse is performing an external eye examination. Which statement regarding the outer layer of the eye is true?
 
  a. The outer layer of the eye is very sensitive to touch.
  b. The outer layer of the eye is darkly pigmented to prevent light from reflecting internally.
  c. The trigeminal nerve (CN V) and the trochlear nerve (CN IV) are stimulated when the outer surface of the eye is stimulated.
  d. The visual receptive layer of the eye in which light waves are changed into nerve impulses is located in the outer layer of the eye.

Question 2

When examining a patient's eyes, the nurse recalls that stimulation of the sympathetic branch of the autonomic nervous system:
 
  a. Causes pupillary constriction.
  b. Adjusts the eye for near vision.
  c. Elevates the eyelid and dilates the pupil.
  d. Causes contraction of the ciliary body.

[Tonyam972]

Answer to Question 1

ANS: A
The cornea and the sclera make up the outer layer of the eye. The cornea is very sensitive to touch. The middle layer, the choroid, has dark pigmentation to prevent light from reflecting internally. The trigeminal nerve (CN V) and the facial nerve (CN VII) are stimulated when the outer surface of the eye is stimulated. The retina, in the inner layer of the eye, is where light waves are changed into nerve impulses.

Answer to Question 2

ANS: C
Stimulation of the sympathetic branch of the autonomic nervous system dilates the pupil and elevates the eyelid. Parasympathetic nervous system stimulation causes the pupil to constrict. The muscle fibers of the iris contract the pupil in bright light to accommodate for near vision. The ciliary body controls the thickness of the lens.

[j.rubin]

Excellent

[LVPMS]

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