Cranial Nerve Assessment: II. Optic |
Examination type |
Neurological |
Patient & Body Segment Positioning |
Patient needs to be in a comfortable position,
either
sitting or standing. |
Examiner Position |
The examiner needs to be anterior to (in front
of) the patient |
Performing the Test |
When testing,
assess each eye individually and then both eyes together. Two
tests should be conducted:
Testing Visual
Acuity:
Ask patient to read an object close up & and another object far
away. Ex. number of fingers that are being held up or a sign
Testing
Peripheral Vision:
Ask the patient to look straight ahead. Extend your hand behind
the patient's head and out of the field of vision with the index
finger extended and pointing upward. Slowly bring your hand
forward until the patient reports seeing the index finger in his
field of vision. Perform bilaterally and compare results.
|
Tissues
Being Tested |
Cranial
nerve II. Optic nerve |
Positive Test |
Inability to
read or identify objects either close up, far away, or both. |
Interpretation |
Intracranial involvement; Blindness in part or all of
the visual field can indicate cranial nerve damage |
Common errors in
performing exam |
Not testing
short distance acuity; Not testing each eye individually |
Factors possibly
resulting in misinterpretation |
Make sure that the athlete understands what you
are doing when performing the test |
Related tests |
Cranial
nerve assessment |
References |
Booher M. James. Athletic Injury
Assessment. 4th edition. McGraw Higher
Education 2000 |
Links: |
http://www.medicinenet.com/visual_field_test/article.htm |
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