This video shows a cluster of Elschnig pearls that have formed behind the lens after cataract surgery. These grape-like clusters form from residual lens epithelial cells that migrate along the remaining capsular bag. They can be seen with a microscope and are usually visually insignificant.
When epithelial cells form in the central visual axis, this is called a PCO (posterior capsular opacification) or after-cataract … and requires capsulotomy removal with a laser. You can see this central capsulotomy better in the photos below.
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elschnigpearls.wmv (4.0 meg, Windows video file)