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Intraocular lens material evaluation by iris abrasion in vitro: a scanning electron microscope study
N L Burstein1, M Ding, M V Pratt
1Department of Ophthalmology, California College of Medicine, Irvine 92717.
Journal of Cataract and Refractive Surgery
|September 1, 1988
Summary
Surface-modified intraocular lenses (IOLs) showed less iris abrasion than standard polymethylmethacrylate (PMMA) or silicone IOLs in an in vitro test. This suggests a potential to reduce pigment dispersion and iris adhesions in patients.
Area of Science:
- Ophthalmology
- Biomaterials Science
- Medical Device Engineering
Background:
- Prosthetic posterior chamber intraocular lenses (IOLs) can cause iris complications like pigment dispersion and adhesions.
- Iris abrasion by IOL materials is a concern for patient outcomes.
Purpose of the Study:
- To evaluate and compare the potential for iris abrasion caused by different IOL materials.
- To introduce a novel in vitro testing method for assessing IOL-iris interactions.
Main Methods:
- An in vitro test was developed using pigmented rabbit irides and three IOL materials: polymethylmethacrylate (PMMA), silicone, and surface-modified PMMA.
- Each IOL material was rubbed 1,000 times on the iris with a 0.5-gram force.
- Abraded irides were analyzed using scanning electron microscopy and scored for damage.
Main Results:
- Polymethylmethacrylate (PMMA) lenses completely removed iris epithelium, exposing connective tissue.
- Silicone lenses caused elongated, narrower damage areas, also exposing connective tissue.
- Surface-modified PMMA lenses resulted in minimal damage, primarily affecting suspensory ligaments.
Conclusions:
- Surface-modified PMMA IOLs demonstrate significantly less iris abrasion compared to conventional PMMA and silicone IOLs in this in vitro model.
- The developed in vitro test provides a valuable method for assessing IOL material biocompatibility regarding iris interaction.
- Further in vivo animal implantation studies are recommended to validate these findings and confirm the clinical benefit of surface-modified PMMA IOLs in reducing iris-lens complications.