„Snowflake” or „crystalline” opacification of poly(methyl methacrylate) (PMMA) intraocular lens optic biomaterial: a newly described syndrome caused by an unexpected late biodegradation of PMMA. - Peng ,Q.; Apple ,D.J.; Arthur ,S.; Merrit ,J.; Escobar Gomez ,M.; Hoddinott ,D. (Int Ophth Clinics, 2001)