Contamination of diagnostic ophthalmic solutions in primary eye care settings

Area of Science:

• Ophthalmology
• Microbiology
• Pharmaceutical Science

Background:

• Pharmaceutical agents and irrigating solutions are essential in optometric and ophthalmologic practices.
• Contamination of these medical supplies may lead to patient infections.

Purpose of the Study:

• To investigate the contamination rates of pharmaceutical agent and irrigating solution containers.
• To identify microorganisms present in contaminated ophthalmic solutions and container residues.

Main Methods:

• Sixty samples of proparacaine, tropicamide, and irrigating solution bottles were collected from optometric and ophthalmologic practices.
• Samples underwent random culturing to detect microbial contamination.
• Container threads and residues were cultured to assess surface contamination.

Main Results:

• 11.7% of the tested solutions were contaminated with microorganisms.
• Predominant organisms included Pseudomonas cepacia, Staphylococcus epidermidis, Pseudomonas putida, and Streptococcus species.
• 76.5% of container residue samples tested positive for Staphylococcus and Micrococcus species.

Conclusions:

• Ophthalmic pharmaceutical containers and solutions can harbor microbial contamination.
• Bacterial residues on container threads present a significant contamination risk.
• Findings highlight the need for stringent handling and storage protocols to prevent ocular infections.