Clinical Report: 25 Years of Silicone Hydrogel Contact Lenses

Overview

Silicone hydrogel (SiHy) contact lenses, commercialized 25 years ago, now represent nearly 80% of new lens fittings worldwide. They offer improved oxygen permeability, reducing metabolic complications historically associated with contact lens wear, though infection rates remain similar to hydrogel lenses. SiHy lenses are increasingly used in specialty applications including pediatric, therapeutic, and custom lenses, despite limited high-level evidence for superiority in some indications.

Background

Silicone hydrogel materials revolutionized contact lens wear by enhancing oxygen transmission to the cornea, mitigating hypoxia-related complications common with earlier hydrogel lenses. Since their introduction, SiHy lenses have become the dominant material globally, especially in Asia where urbanization and myopia prevalence drive demand. While daily disposable lenses are preferred for reducing complications, extended wear remains uncommon. Specialty uses of SiHy lenses include pediatric aphakia, myopia control, therapeutic bandage lenses, and custom rehabilitative designs.

Data Highlights

Key Findings

• SiHy lenses have largely eliminated metabolic complications related to hypoxia seen with earlier hydrogel lenses.
• Infectious keratitis rates are similar between SiHy and hydrogel lens wearers, with no material-specific impact on vision-threatening disease.
• Daily disposable lenses significantly reduce inflammatory infiltrates compared to reusable lenses, regardless of material.
• SiHy lenses are widely used in pediatric aphakia and myopia control, though cost and parameter availability can be barriers.
• Therapeutic applications of SiHy lenses include corneal protection and pain relief, with emerging roles in cellular therapies and drug delivery.
• Custom SiHy lenses support complex refractive corrections and rehabilitative needs, with recommendations favoring daily disposables and high oxygen permeability.

Clinical Implications

Clinicians should consider SiHy lenses as the first-line option for most refractive and specialty contact lens indications due to their superior oxygen permeability and safety profile. Daily disposable SiHy lenses are preferred to minimize inflammatory complications. In pediatric and therapeutic contexts, SiHy lenses offer versatility but require attention to cost and patient-specific factors. Ongoing monitoring for infection risk remains essential, as material type does not eliminate this concern.

Conclusion

Silicone hydrogel lenses have transformed contact lens practice over the past 25 years by improving wearer safety and expanding clinical applications. While infection risks persist at similar rates to hydrogel lenses, the metabolic benefits and adaptability of SiHy materials support their continued dominance and evolving specialty use.

References

1. International Contact Lens Prescribing Report 2023 -- Market and Usage Data
2. Euromonitor 2020 -- Asia Contact Lens Market Analysis
3. Cochrane Review -- Impact of Contact Lens Materials on Vision-Threatening Disease
4. Clinical Studies on Infectious Keratitis Incidence in Contact Lens Wearers
5. Pediatric Contact Lens Practice and Myopia Control Literature
6. Therapeutic and Custom Silicone Hydrogel Lens Applications