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Low-power microwave disinfection of soft contact lenses
1Department of Ophthalmology, Tulane University School of Medicine, New Orleans, LA 70112, USA.
Purpose:
To evaluate the effectiveness of low-power microwave irradiation on the disinfection of contaminated contact lenses.
Methods:
We infected 24 soft contact lenses with Staphylococcus epidermidis, Staphylococcus aureus, and Pseudomonas aeruginosa. Each contact lens was placed into a vial containing 10 mL of contaminated, non-preserved saline. Each vial was then exposed to 2, 4, 6, 9, 12, 15, or 18 minutes of microwave irradiation in an oven (2,450 MHz 600W) set at 10% power.
Results:
We found all contact lenses to be disinfected after 15 minutes of exposure. All lenses remained hydrated and revealed no apparent damage when examined under the slit-lamp biomicroscope.
Conclusions:
Low level microwaving in a home microwave oven can result in effective and non-damaging disinfection of soft contact lenses.
Insights
Low-power microwave irradiation effectively disinfects contaminated soft contact lenses. This method is safe, causing no damage to the lenses after 15 minutes of exposure in a home microwave.
Area of Science:
- Ophthalmology
- Microbiology
- Biomedical Engineering
Background:
- Contact lens wear is associated with a risk of microbial keratitis.
- Effective disinfection methods are crucial for preventing contact lens-related infections.
Purpose of the Study:
- To assess the efficacy of low-power microwave irradiation for disinfecting contaminated soft contact lenses.
- To determine if microwave irradiation causes damage to contact lens material.
Main Methods:
- Soft contact lenses were intentionally contaminated with common ocular pathogens: Staphylococcus epidermidis, Staphylococcus aureus, and Pseudomonas aeruginosa.
- Contaminated lenses were immersed in saline and subjected to microwave irradiation at 10% power (2,450 MHz, 600W) for varying durations (2-18 minutes).
Main Results:
- Complete disinfection of all contact lenses was achieved after 15 minutes of microwave irradiation.
- Post-irradiation examination using a slit-lamp biomicroscope showed no signs of hydration loss or structural damage to the lenses.
Conclusions:
- Low-power microwave irradiation in a standard home microwave oven offers an effective disinfection strategy for soft contact lenses.
- This technique provides a non-damaging method for contact lens disinfection, potentially reducing the risk of microbial contamination.