Effect of excimer laser on microbiological organisms

Area of Science:

• Microbiology
• Biophysics
• Laser Technology

Background:

• Microbial keratitis is a significant cause of vision loss.
• Conventional antimicrobial treatments can be limited by resistance and side effects.
• Novel sterilization methods are needed for treating eye infections.

Purpose of the Study:

• To evaluate the efficacy of 193 nm argon fluoride excimer laser radiation against various microorganisms.
• To determine if the radiation possesses characteristics suitable for therapeutic applications.

Main Methods:

• Exposure of Serratia marcescens, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus faecalis, Hemophilus influenzae, Candida albicans, and Aspergillus niger to variable pulses of 193 nm argon fluoride excimer laser radiation.
• Incubation of microbial colonies for 36 hours at 37°C prior to irradiation.
• Confirmation of microbial viability using subculturing techniques post-irradiation.

Main Results:

• Complete eradication of all tested microorganisms (bacteria and fungi) following laser radiation treatment.
• Subculture analysis confirmed a lack of viability in all irradiated areas.
• Radiation parameters were consistent with those previously reported for similar applications.

Conclusions:

• 193 nm argon fluoride excimer laser radiation demonstrates potent antimicrobial activity against a broad spectrum of microorganisms.
• The observed efficacy suggests that excimer laser treatment may be a viable therapeutic option for corneal infections.
• Further research is warranted to explore the clinical potential of excimer lasers in ophthalmology.