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Two year results: sharp versus rounded optic edges on silicone lenses
A J Kruger1, J Schauersberger, C Abela
1Department of Ophthalmology, University of Vienna, Medical School, Allgemeines Krankenhaus, Vienna, Austria.
Journal of Cataract and Refractive Surgery
|April 20, 2000
Summary
The sharp optic edge design of silicone intraocular lenses (IOLs) significantly reduces posterior capsule opacification (PCO) after two years. Rounded edge IOLs showed higher rates of PCO, necessitating YAG laser treatment in some cases.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Materials Science
Background:
- Posterior capsule opacification (PCO) is a common complication after cataract surgery.
- The design of intraocular lenses (IOLs), specifically the optic edge, may influence PCO development.
- Silicone IOLs are widely used, but their edge design's long-term impact on PCO requires further investigation.
Purpose of the Study:
- To compare the 2-year clinical outcomes of two silicone intraocular lenses (IOLs) with different optic edge designs.
- To evaluate the effect of sharp versus rounded optic edges on posterior capsule opacification (PCO) and anterior capsule alterations.
- To assess IOL decentration and other biomicroscopic findings over a 2-year period.
Main Methods:
- A comparative clinical study involving 50 eyes undergoing phacoemulsification and IOL implantation.
- Group 1 (n=25): CeeOn model 911F (high-refractive, 3-piece silicone IOL with sharp optic edges).
- Group 2 (n=25): CeeOn model 920 (3-piece silicone IOL with rounded optic edges).
- Clinical and biomicroscopic evaluations, including specular microscopy, were performed over 2 years.
- Assessment of posterior capsule opacification (PCO), anterior capsule changes, and IOL decentration.
Main Results:
- A significant difference in PCO was observed between the groups after 2 years; sharp-edge IOLs showed significantly less PCO.
- No PCO requiring neodymium:YAG laser capsulotomy occurred with sharp-edge IOLs, compared to 2 cases with rounded-edge IOLs.
- Anterior capsule alterations did not differ significantly between the groups.
- Minimal IOL decentration occurred in 25% of the sharp-edge group and 40% of the rounded-edge group.
Conclusions:
- The sharp optic edge design of the CeeOn 911F silicone IOL is associated with significantly reduced posterior capsule opacification (PCO) at 2 years postoperatively.
- Rounded optic edge IOLs (CeeOn 920) demonstrated a higher incidence of PCO, including dense central fibrotic PCO requiring intervention.
- IOL optic edge design plays a crucial role in mitigating PCO, a key factor in long-term visual outcomes after cataract surgery.