This video shows a perfluoron bubble sitting in the bottom of the eye in the anterior chamber. This chemical is used during retinal surgery to help lay down the retina. Here it has somehow gotten into the front portion of the eye. Since perfluorocarbon fluid is heavier than water, the bubble has sunken to the bottom of the chamber in front of the iris.
This foreign material needs to be watched closely as it can decompensate the cornea by killing the endothelial surface.
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perfluronbubble.wmv (3.3 meg, Windows video file)