Athletic Training & Sports Medicine Center

 

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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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