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Self-Healing Contact Lenses Arrive!
10 Jul
Summary
- New hydrogel contact lenses can self-heal scratches.
- UV light repairs lenses in about an hour.
- These lenses offer improved durability and eye health.
Chemists from Dankook University in South Korea have unveiled a groundbreaking material for soft contact lenses that possesses self-healing capabilities. These specialized lenses can repair scratches that commonly occur during handling and cleaning.
The innovative hydrogel material utilizes a disulfide cross-linker, a molecule containing a sulfur-sulfur bond. When the lens is scratched, these bonds break but can reconnect under ordinary ultraviolet (UV) light, restoring structural integrity.
Testing demonstrated that the new disulfide-cross-linked hydrogel, or DS-Hydrogel, effectively healed surface scratches, unlike control materials lacking this specific cross-linker. The self-healing process could restore approximately 90 percent of the lens's structural stability.
Beyond self-healing, the developed lenses exhibit water retention comparable to current soft lenses and superior scratch resistance. This dual functionality promises to reduce the frequency of lens replacement and mitigate health risks associated with damaged contact lenses.
While previous self-healing materials required high temperatures, this advancement enables repair using readily available UV equipment, potentially even standard UV lens cleaners. Further safety testing is ongoing before commercial availability, but the technology heralds a future of more resilient and longer-lasting ophthalmic devices.
