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Cellular reactions on heparin surface-modified versus regular PMMA lenses during the first postoperative month. A
J Ygge1, M Wenzel, B Philipson
1Department of Ophthalmology, Karolinska Institutet, Huddinge Hospital, Sweden.
Abstract:
Specular microscopy was used for investigation of cellular reactions on the intraocular lens (IOL) anterior surface of Heparin surface-modified (HSM) versus regular polymethylmethacrylate (PMMA) lenses (Pharmacia types 700C versus 700B, respectively). The double-masked randomized study included 53 patients investigated at 1 and 4 weeks postoperatively. Giant cells were only found on control lenses and more frequently at 4 weeks. Small cells were found on both lens types, but in a higher frequency on the control lenses. The number of small cells decreased during the first 4 weeks on both the control and HSM lenses. However, those control lenses that had giant cells on their surface showed an increase in the number of small cells during the same time. The results of the current study show that HSM lenses give rise to less postoperative inflammatory cellular reactions than regular PMMA lenses.
Insights
Heparin surface-modified (HSM) intraocular lenses (IOLs) showed fewer inflammatory cell reactions compared to regular polymethylmethacrylate (PMMA) lenses. This suggests HSM IOLs may offer improved biocompatibility post-surgery.
Area of Science:
- Ophthalmology
- Biomaterials Science
- Cell Biology
Background:
- Intraocular lens (IOL) implantation is a common surgical procedure.
- Cellular reactions on IOL surfaces can influence postoperative outcomes.
- Polymethylmethacrylate (PMMA) is a standard IOL material, but inflammatory responses can occur.
Purpose of the Study:
- To compare the anterior surface cellular reactions of Heparin surface-modified (HSM) IOLs versus regular PMMA IOLs.
- To evaluate the impact of IOL surface modification on postoperative inflammation.
Main Methods:
- Specular microscopy was employed to investigate cellular reactions on IOLs.
- A double-masked, randomized study design was used.
- 53 patients were assessed at 1 and 4 weeks postoperatively.
Main Results:
- Giant cells were exclusively observed on control PMMA lenses, with increased frequency at 4 weeks.
- Small cells were present on both HSM and PMMA lenses, but more prevalent on PMMA.
- While small cell numbers decreased on both lens types over 4 weeks, control lenses with giant cells showed an increase in small cells.
Conclusions:
- Heparin surface-modified (HSM) IOLs demonstrate reduced postoperative inflammatory cellular reactions compared to regular PMMA IOLs.
- HSM IOLs appear to have improved biocompatibility, potentially leading to better clinical outcomes.