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A perfluoropolyether corneal inlay for the correction of refractive error
Margaret D M Evans1, Ruby K Prakasam, Pravin K Vaddavalli
1Vision Cooperative Research Centre, Rupert Myers Building, Sydney, NSW 2052, Australia. meg.evans@csiro.au
Biomaterials
|February 11, 2011
Summary
This study evaluated a perfluoropolyether corneal inlay for refractive error correction. The biocompatible inlay demonstrated long-term stability and potential as a refractive implant, despite minor optical clarity reduction over time.
Area of Science:
- Ophthalmology
- Biomaterials Science
- Polymer Science
Background:
- Refractive errors necessitate corrective measures, driving innovation in ophthalmic implants.
- Perfluoropolyether-based polymers offer unique properties for potential biomedical applications.
Purpose of the Study:
- To assess the long-term biological response and efficacy of a novel perfluoropolyether corneal inlay for refractive error correction.
- To evaluate the biocompatibility and structural integrity of the polymer inlay in vivo.
Main Methods:
- In vitro cytotoxicity testing of the perfluoropolyether polymer formulation.
- Implantation of microporous polymer membranes as corneal inlays in rabbits and humans.
- Long-term monitoring (up to 48 months) of inlay tolerance, corneal health, and optical clarity.
Main Results:
- The polymer formulation was non-cytotoxic and met physical specifications.
- Corneal inlays were generally well-tolerated, maintaining corneal clarity and position without significant inflammation or vascularization.
- While optical clarity decreased slowly over time, inlays induced stable refractive changes that reversed upon removal. Some early removals were due to focal erosions.
Conclusions:
- Perfluoropolyether corneal inlays show promise as biologically acceptable implants for stable refractive error correction.
- The material demonstrated long-term biocompatibility and structural integrity in vivo.
- Further research may optimize optical properties for sustained visual performance.
