New material for low-cost intraocular lenses

Area of Science:

• Ophthalmology
• Biomaterials Science
• Polymer Chemistry

Background:

• Intraocular lenses (IOLs) are crucial for vision restoration after cataract surgery.
• Developing cost-effective IOL materials is essential for wider accessibility.
• Polyurethane-based UV-hardening lacquers, utilized in optical systems, present a potential alternative.

Purpose of the Study:

• To evaluate a specific polyurethane UV-hardening lacquer (I-0.5A) as a candidate material for low-cost intraocular lenses.
• To assess the biocompatibility and in vivo performance of this material in a rabbit eye model.
• To compare its properties and biological response against established intraocular lens materials like poly(methyl methacrylate) (PMMA).

Main Methods:

• In vitro biocompatibility testing of the polyurethane material.
• In vivo implantation of 'lobster-claw' IOLs made from the I-0.5A lacquer in Hollander rabbit eyes for 24 weeks.
• Histopathological and scanning electron microscopy (SEM) analysis of explanted IOLs and surrounding ocular tissues.
• Assessment for carcinogenic effects and corneal vascularization.

Main Results:

• The modified polyurethane composition (I-0.5A) demonstrated positive in vitro biocompatibility.
• No carcinogenic effects were detected during the 24-week study period.
• Minor corneal vascularization at the incision site was observed, comparable to PMMA.
• SEM revealed typical foreign body reactions, including giant cells and fibroblast interactions, similar to PMMA.

Conclusions:

• The tested UV-hardening polyurethane lacquer (I-0.5A) is biocompatible and suitable for intraocular lens manufacturing.
• Its performance in rabbit eyes is comparable to poly(methyl methacrylate), suggesting potential for low-cost IOLs.
• Further research may validate this material for widespread clinical application in ophthalmology.