Fungal contamination of contact lenses

Overview of fungal contamination in contact lenses

Fungal Contamination of Contact Lenses

A contact lens on a fingertip

Fungal contamination of contact lenses is a significant concern in ophthalmology, as it can lead to serious eye infections, including keratitis. This condition occurs when fungi adhere to the surface of contact lenses, proliferate, and potentially invade the corneal tissue.

Causes

Fungal contamination can occur due to several factors, including improper lens hygiene, exposure to contaminated water, and inadequate disinfection practices. Fungi such as Fusarium and Aspergillus are common culprits. These microorganisms can thrive in the moist environment provided by contact lenses and their storage cases.

Common Fungi Involved

Fusarium verticillioides, a common fungal contaminant

The most frequently implicated fungi in contact lens contamination are species of the genus Fusarium. Fusarium species are filamentous fungi found in soil and organic matter. They can cause Fusarium keratitis, a severe infection of the cornea that can lead to vision loss if not treated promptly.

Risk Factors

Several risk factors increase the likelihood of fungal contamination:

• Poor Lens Hygiene: Not cleaning lenses properly or failing to replace them as recommended.
• Use of Tap Water: Rinsing lenses or lens cases with tap water can introduce fungi.
• Inadequate Disinfection: Using ineffective or expired disinfecting solutions.
• Extended Wear: Wearing lenses for longer than recommended periods.

Prevention

Preventing fungal contamination involves strict adherence to lens care guidelines:

• Proper Cleaning: Use only recommended solutions for cleaning and storing lenses.
• Avoid Water Exposure: Do not expose lenses to water, including swimming or showering with lenses in.
• Regular Replacement: Follow the replacement schedule for lenses and cases.
• Hygienic Practices: Wash hands thoroughly before handling lenses.

Symptoms of Fungal Keratitis

Symptoms of fungal keratitis can include:

• Eye pain
• Redness
• Blurred vision
• Sensitivity to light
• Excessive tearing or discharge

Diagnosis and Treatment

Diagnosis of fungal keratitis involves a thorough eye examination and laboratory analysis of corneal scrapings. Treatment typically includes antifungal medications, which may be administered topically or orally. In severe cases, surgical intervention such as a corneal transplant may be necessary.

Related Pages

• Contact lens
• Keratitis
• Fusarium
• Aspergillus

A contact lens case, a potential source of contamination

Conclusion

Fungal contamination of contact lenses is a preventable condition that requires diligent care and hygiene practices. By understanding the risks and adhering to recommended guidelines, contact lens wearers can significantly reduce their risk of developing serious eye infections.