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Medical Tests CEN Exam (page: 1)
Medical Tests Certified Emergency Nurse
Updated on: 12-Feb-2026

Viewing Page 1 of 26
CEN PDF 195 Questions

You are administering a Snellen chart test to a patient. What results would you expect to get if your patient was legally blind?

  1. 20/20 vision
  2. 20/40 vision
  3. 20/60 vision
  4. 20/200 vision

Answer(s): D

Explanation:

The patient would be considered legally blind if the result of the Snellen chart test is 20/200 vision. This means that the patient is able to read at 20 feet what a person with normal vision can read at 200 feet. Legal blindness is defined as 20/200 or less with corrected vision or visual acuity of less than 20 degrees of the visual field in the better eye.



What is the normal intraocular pressure of the eye?

  1. 2 to 7 mm Hg
  2. 10 to 21 mm Hg
  3. 22 to 30 mm Hg
  4. 31 to 35 mm Hg

Answer(s): B

Explanation:

The normal intraocular pressure of the eye is 10 to 21 mm Hg. The test used to measure intraocular pressure is called a tonometry. This is how glaucoma is diagnosed. A patient with glaucoma would have an intraocular pressure of 30 to 70 mm Hg.



Your patient has been diagnosed with a hyphema following hitting their head on the steering wheel during a car accident. What position would you want to place this patient in?

  1. Supine
  2. Semi- fowlers
  3. Lateral
  4. Trendelenburg

Answer(s): B

Explanation:

The patient should be placed in semi-fowlers position on bed rest. A hyphema is caused by a force, such as hitting your head on the steering wheel, strong enough to break the blood vessels in the eye. Placing the patient in semi-fowlers position lets gravity work to keep the hyphema away from the optical center of the cornea.



Your patient has arrived in the emergency department with a penetrating eye injury. You are assessing the patient. What should your first action be?

  1. Remove any objects from the eye.
  2. Place a patch over the eye.
  3. Perform a visual acuity test.
  4. Use sterile saline to irrigate the eye.

Answer(s): C

Explanation:

You would want to perform visual acuity tests on the affected eye first. This allows the nurse to assess any damage to the vision. Any foreign objects in the eye should only be removed by an ophthalmologist. Do not cover or rinse eye because it may dislodge foreign objects and cause further damage to the eye.



Your patient has arrived in the emergency department with a chemical eye injury. Your first action should be to:

  1. Perform a visual acuity test
  2. Use sterile saline to irrigate the eye
  3. Place antibiotic ointment in the eye
  4. Place a patch over the eye

Answer(s): B

Explanation:

The first reaction by the nurse should be to irrigate the eye with normal saline. This should be done for at least 10 minutes to remove any chemicals from the eye. Following irrigation of the eye the patient should have visual acuity tests to determine the extent of damage to the eye.



You are caring for a patient who has come into the emergency department with a foreign body in his right ear. After further investigation you determine that the foreign object is an insect. What intervention would the physician order first for this client?

  1. Sterile normal saline irrigation
  2. Diluted alcohol irrigation
  3. Antibiotic ear drops
  4. Corticosteroids ointment

Answer(s): B

Explanation:

The nurse would know that the physician will order diluted alcohol irrigation of the affected ear. This will suffocate the insect so it can be removed from the ear with forceps. If the foreign object were vegetable matter, irrigation would not be performed due to the enlargement of the object when it is hydrated, which would make the impaction worse.



When caring for a patient what sign would indicate that he might have a basal skull fracture?

  1. The auditory canal has purulent drainage.
  2. The auditory canal has bloody or clear drainage.
  3. Epistaxis
  4. Periorbital edema

Answer(s): B

Explanation:

A basal skull fracture would be indicated by bloody or clear drainage from the auditory canal. This indicates a cerebrospinal fluid leak from the fracture. This is a medical emergency and needs to be addressed by the physician immediately.



You are caring for a patient who complains of tinnitus. What part of the ear do you suspect is the most likely cause of the patient's complaint?

  1. External ear
  2. Middle ear
  3. Inner ear
  4. Auricle

Answer(s): C

Explanation:

Tinnitus is the most common complaint of patients with disorders of the inner ear. Tinnitus is a ringing in the ear that can be loud intolerable ringing or mild ringing that can be unnoticed during the day.



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