The disinfecting potential of contact lens soutions used by Sultan Qaboos University students

Abstract EN

Objectives : This study aimed to determine the disinfecting potential of some contact lens solutions used by some university students in Oman.

Methods : This work was carried out from January to June 2010 in the Department of Microbiology and Immunology, College of Medicine and Health Sciences, Sultan Qaboos University, Oman.

Fifty disinfecting solutions, in which contact lenses were disinfected according to the manufacturers’ instructions, were collected from the students and plated on various microbiological culture media.

Bacterial isolates were identified by API-20E, API-20NE and Phoenix automated systems while fungi were identified by their cultural characteristics and biochemistry.

Results : From 98 isolates, Pseudomonas aeruginosa was 23.5%; Penicillium, 13%; Candida species, 9.2%; coagulase negative staphylococci, 9.2%; Serratia marcescens, 6.1%; Bacillus, 5.1%; Aspergillus flavus, 5.1%; Serratia liquefaciens, Pseudomonas fluorescens, Enterobacter cloacae and Aspergillus niger, 4.1% each; Chryseomonas Luella and Chryseomonas indulgences, 3.1% each; Stenotrophomonas maltophilia, Serratia odoriferous, 2.0% each; Enterobacter aero genes and Klebsiella pneumonia, 1% each.

Most isolates (65%) came from polyhexanide containing solutions.

Conclusion: Contact lens disinfecting solutions with the same formulations, but manufactured by different companies, possessed different disinfecting potentials.