Nd:YAG laser photocystotomy of a free-floating pigmented anterior vitreous cyst.

An 8-year-old girl presented with a free-floating pigmented cyst in the anterior vitreous causing a large, visually disturbing floater. A simple laser photocystotomy with a single-frequency Nd:YAG laser resulted in a reduction in the size of the cyst but persistence of the floater. An attempt at further laser fragmentation of the cyst resulted in iatrogenic cataract formation.