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[Plastics on the eye - plastics in the eye. Human-optic materials]
Otto-Christian Geyer1, Peter Schwabe, Frank Wingler
1Institut für Medizinische Sehhilfen, Bahnhofstrasse 19 b, 35576 Wetzlar.
Klinische Monatsblatter Fur Augenheilkunde
|April 5, 2002
Summary
High purity polymers are essential for intraocular lenses (IOLs) to ensure biocompatibility and long-term stability. Current manufacturing lacks standardization, leading to variable material performance and UV blocker longevity.
Area of Science:
- Ophthalmic biomaterials
- Polymer science
- Medical device engineering
Background:
- Materials for ocular devices, including contact lenses and intraocular lenses (IOLs), originate from industrial chemical developments.
- These materials must be biocompatible, non-reactive, and resistant to degradation within the ocular environment.
Purpose of the Study:
- To highlight the critical need for high purity polymers and long-term light stability in ophthalmic materials.
- To emphasize the importance of verifying the stability of UV-absorbing additives in intraocular lens materials.
Main Methods:
- Analysis of polymer formulations used in intraocular lenses.
- Evaluation of aging and fatigue properties based on different polymer compositions.
- Assessment of the long-term light stability of incorporated UV blockers.
Main Results:
- Most intraocular lens materials, excluding polymethylmethacrylate homopolymer, utilize interpenetrating polymer networks.
- Lack of standardized manufacturing protocols results in diverse aging and fatigue characteristics.
- Inadequate data exists regarding the long-term light stability of UV blockers in these materials.
Conclusions:
- Polymeric materials for IOLs require comprehensive chemical, polymeranalytic, and mechanical testing beyond existing EN-ISO standards.
- A polymethylmethacrylate standard, free of methylacrylate, is proposed for material examination.
- Mandatory lot-specific testing and transparent ingredient labeling, similar to pharmaceuticals, are recommended to inform patients of potential risks.