Unfortunately there is a lot of reports about this issue. The management depend on the degree of opacification and visual acuity impairment. If it is severe the best choice is to replace it with scleral fixation lens. In my experience no total calcification been seen but dot pigmentation is often among lenses implanted for more than 10 years ago. Complains are not so sever and still not motivating replacement.

Intraocular lens opacification and some locaized calcification is  not uncommon in several of the hydrophillic acrylic intraocular lens and in few hydrophobic IOL in the past but current designs of hyrophobic acrylic IOL opacification or calcification is rare. I have managed these patients of IOL Opacification with IOL exchange with hydrophobic acrylic IOL in the bag preferably if feasible or in the sulcus with excellent outcome.

Jagat Ram is absolutely right, hydrophobic acrylic IOL has significantly reduced incidence of calcification and formation of any kind of deposits in that matter because the material does not react to the aqueous humour.

Watch http://medtube.net/ophthalmology/medical-videos/12984-iol-replacement-cataract-surgery on how you can replace the lens.

I agreee with my colleagues indicated that it is so-named "cataract of IOL" due to hydrophylic material of IOL. The only option is to replace the lens.