Swinging Light Test

Swinging Light Test - As you go back and forth youll see...

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The Swinging Light Test If one eye is injured, or not sensing light, then your patient may have an APD or “afferent pupillary defect.” Often these defects are only partial, making them difficult to detect on casual examination. To detect small APDs, you need to perform the “Swinging Light Test.” Here’s how it works: When you shine a light back and forth between two normal eyes, you’ll find that the pupils constrict, then dilate a fraction as the light beam passes over the nose, and then constrict again.
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Unformatted text preview: As you go back and forth youll see constriction, constriction, constriction, and constriction. Things look different if one eye is partially blind. As before, when you shine the light in the good eye there is constriction. But, when you cross to the other bad eye, both eyes seem to dilate a little. The bad eye still senses light and constricts, but not as well. So you see constriction, dilation, constriction, and dilation. This phenomenon is also called a Marcus Gunn pupil....
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This note was uploaded on 07/01/2011 for the course BMS 6016 taught by Professor Hagen during the Spring '11 term at University of Florida.

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