Chapter 16: Assessing Eyes PrepU
How can a nurse accurately assess the distant visual acuity of a client who is non-English speaking?
Use a Snellen E chart to perform the examination Explanation: If a client does not speak English, is unable to read, or has a verbal communication problem, the Snellen E chart can be used to test the client's distant visual acuity. With this test, the client is asked to indicate by pointing which way the E is open on the chart. The six cardinal positions of gaze test eye muscle function and cranial nerve function. The Jaeger chart tests near visual acuity. Confrontation test is used to test visual fields for peripheral vision.
A 52-year-old patient with myopia calls the ophthalmology clinic very upset. Shetells the nurse, "I keep seeing semi-clear spots floating across my vision. What is wrong with me?" What would be the most appropriate response by the nurse?
"It is not an uncommon finding in people older than 40 years for this to happen. They are called 'floaters'." Explanation: Floaters (translucent specks that drift across the visual field) are common in people older than 40 years of age and nearsighted patients; no additional follow-up is needed.
A client has been diagnosed with astigmatism. The nurse should be prepared to teach the client about which treatment for this condition?
Corrective lenses Explanation: Astigmatism is corrected with a cylindrical lens that has more focusing power in one access than the other. These corrective lenses can and should be worn while driving at night. Eye drops and surgery are not usual treatments for this condition.
What is a characteristic symptom of Graves hyperthyroidism?
Exophthalmos Explanation: In exophthalmos the eyeball protrudes forward. When bilateral, it suggests the infiltrative ophthalmopathy of Graves hyperthyroidism.
A 29-year-old physical therapist presents for evaluation of an eyelid problem. On observation, the right eyeball appears to be protruding forward. Based on this description, what is the most likely diagnosis?
Exophthalmos Explanation: In exophthalmos, the eyeball protrudes forward. If it is bilateral, it suggests the presence of Graves' disease, although unilateral exophthalmos could still be caused by Graves' disease. Alternative causes include a tumour and inflammation in the orbit.
A middle-aged client reports difficulty in reading. Which action by the nurse is appropriate to test near visual acuity using a Jaeger reading card?
Instruct the client hold the chart 14 inches from the eyes Explanation: To test near visual acuity, the nurse should have the client hold the chart 14 inches from the eyes. The Snellen chart should be kept at eye level, 20 feet away on the wall when testing for distant vision. An arms length is an arbitrary length depending on the size of the client and is not an accurate method for testing. The chart should not be placed on a table 17 inches away from the client.
A client frequently experiences dry, irritated eyes. These findings are consistent with a problem in what part of the eye?
Lacrimal apparatus Explanation: The lacrimal apparatus (which consists of the lacrimal gland, punctum, lacrimal sac, and nasolacrimal duct) protects and lubricates the cornea and conjunctiva by producing and draining tears.
A nurse notices a middle-aged client in the waiting room pick up a magazine to read while she waits to be seen. She opens the magazine and then extends her arms to move it further from her eyes. Which condition does the nurse most suspect in this client?
Presbyopia Explanation: Presbyopia, which is impaired near vision, is indicated when the client moves a reading chart or other reading material away from the eyes to focus on the print. It is caused by decreased accommodation and is a common condition in clients over 45 years of age. With the cover test, the eyes of the client should remain fixed straight ahead. If the covered eye moves when uncovered to reestablish focus, it is abnormal. If the eye turns outward it is called exotropia. If the uncovered eye turns inward, it is called esotropia. Strabismus is constant malalignment of the eyes.
When testing the near reaction, an expected finding includes which of the following?
Pupillary constriction on near gaze; dilation on distant gaze Explanation: During accommodation, pupils constrict with near gaze and dilate with far gaze.
Which of the following is a symptom of the eye?
Scotomas Explanation: Scotomas are specks in the vision or areas where the client cannot see; therefore, this is a common and concerning symptom of the eye. Tinnitus is a ringing in the ears, dysphagia is difficulty swallowing, and rhinorrhea is a "runny nose."
The nurse is caring for a 63-year-old client who can neither read nor speak English. What would be the appropriate chart to use to assess this patient's vision?
Snellen E Explanation: The Snellen E chart can be used for people who cannot read or speak English.
When preparing to examine a patient's sclera and conjunctiva during an eye examination, the nurse should instruct the patient to move both eyes to look in which direction?
Up Explanation: The correct technique to use when examining a patient's sclera and conjunctiva during an eye examination is to instruct the patient to look up. Having the patient look down, to the right, or to the left will not provide visualization of the sclera or conjunctiva during the examination.
The meibomian glands secrete
an oily substance to lubricate the eyes. Explanation: Meibomian glands secrete an oily substance that lubricates the eyelid.
While assessing the eye of an adult client, the nurse observes an inward turning of the client's left eye. The nurse should document the client's
esotropia. Explanation: Esotropia is an inward turn of the eye.
When assessing the fundus of the eye, the nurse recognizes which normal characteristic represented in dark-skinned individuals?
fundus is grayish brown with a purplish cast Explanation: An eye assessment of a dark-skinned person would include the grayish brown, almost purplish cast to the normal fundus. The remaining options are noted in an eye assessment of the normal fundus of a fair-skinned person.
A patient complains of feeling like he is slowly losing his central vision. The nurse knows this symptom could represent
macular degeneration Explanation: Macular degeneration causes deterioration in the center of the retina, which leads to a gradual loss of central vision.
Straight movements of the eye are controlled by the
rectus muscles. Explanation: The extraocular muscles are the six muscles attached to the outer surface of each eyeball. These muscles control six different directions of eye movement. Four rectus muscles are responsible for straight movement, and two oblique muscles are responsible for diagonal movement.
A 12-year-old presents to the clinic with his father for evaluation of a painful lump in the left eye. It started this morning. The client denies any trauma or injury. There is no visual disturbance. Upon physical examination, there is a red raised area at the margin of the eyelid that is tender to palpation; no tearing occurs with palpation of the lesion. Based on this description, what is the most likely diagnosis?
Stye Explanation: A hordeolum or stye is a painful, tender, erythematous infection in a gland at the margin of the eyelid.
A client is assigned a visual acuity of 20/100 in her left eye. Which of the following is true?
She can see at 20 feet what a normal person could see at 100 feet. Explanation: The denominator of an acuity score represents the line on the chart the client can read. In the example above, the client could read the larger letters corresponding with what a normal person could see at 100 feet.
The nurse is preparing to examine an adult client's eyes, using a Snellen chart. The nurse should
position the client 609.6 cm (20 ft) away from the chart. Explanation: Used to test distant visual acuity, the Snellen chart consists of lines of different letters stacked one above the other. The letters are large at the top and decrease in size from top to bottom. The chart is placed on a wall or door at eye level in a well-lighted area. The client stands 20 feet from the chart and covers one eye with an opaque card (which prevents the client from peeking through the fingers). Then the client reads each line of letters until he or she can no longer distinguish them.
