But people with severe nearsightedness or thin corneas aren't ideal candidates for the treatment because of the risk of keratectasia, an abnormality of the cornea.    From Wordnik.com.  [Medlogs - Recent stories] Reference

Intacs segments for the correction of  keratoconus J cataract Refract Surgery 2005 May,31 (5) 943-956 Malaroni A. and cols Conservative treatment of early and moderate  pellucid degenaration: a new refractive approach with intracorneal rings Ophthalmology 2005 Apr 112 (4) 660-6 Pokroy and cols Single Intacs segment for post-laser in situ  keratomileusis keratectasia J Cataract Refract Surg 2004 Aug30 (8) 1686-95 Boxer BS and cols Intacs for Keratoconus Ophthalmology 2003 Aug  110 (8) 1475 Wednesday, March 11, 2009.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference