ABSTRACT
One hundred sixteen (116) one-piece silicone implants (STAAR 4203C) designed for capsular bag placement have been implanted since July 1987 and followed for up to two years. It appears that the posterior capsular opacification rate is significantly less than with sulcus-fixated one-piece silicone implants. This has been achieved by incorporating the small round capsulotomy using the capsulorhexis technique in addition to a modified endocapsular phacoemulsification technique. The percentage of posterior capsules requiring neodymium:YAG laser treatment in the first four months was 4.3 for the 4203C silicone IOLs and 20.0 for the sulcus-fixated one-piece silicone IOLs. The opacification rates for the one-year follow-up were 11% and 31%, respectively.
Subject(s)
Lens Capsule, Crystalline/surgery , Lenses, Intraocular , Silicone Elastomers , Cataract/etiology , Cataract Extraction/methods , Follow-Up Studies , Humans , Lenses, Intraocular/adverse effectsABSTRACT
Repeat A-scans of 45 patients who had silicone intraocular lens (IOL) implantation indicated an apparent increase in the axial length of the eyes. The average increase of 1.045 mm over the original axial length was noted when using the pseudophakic mode for the axial length determination. The actual velocity of sound in eyes with a silicone IOL is 1,486 M/sec compared to 1,548 M/sec in an eye with a polymethylmethacrylate implant. This finding is clinically significant when one is comparing the axial length of two eyes, one of which is pseudophakic. A 1 mm difference in axial length can cause serious doubts about the validity of one or the other of the scans if the type of implant is not known. The velocity of RMX-3 silicone was determined to be 1,049 M/sec.
Subject(s)
Eye/pathology , Lenses, Intraocular , Ultrasonography , Humans , SiliconesABSTRACT
The incidence and time of onset of posterior capsular opacification in a consecutive series of 147 silicone lens implants and in 585 polymethylmethacrylate (PMMA) lens implants were compared. Silicone lenses, sulcus and capsular bag fixated, had an opacification rate of 27.9%, while PMMA had a rate of 7.0%. In the silicone lens series, 65.9% of the opaque capsules required YAG laser posterior capsulotomies in the first four months. In the PMMA implants, only 28.6% required YAG laser capsulotomies in the first four months. The mean follow-up time was nine months. Management of capsular opacification in silicone lenses required early YAG laser capsulotomy, with focusing posterior to the capsule to avoid pitting the implant.
