High Temperatures Could Harm Your Contact Lens Solution

In a US study it has been found that prolonged exposure to high temperatures degrades the antifungal properties of the ReNu with MoistureLoc contact lens solution manufactured by Bausch & Lomb. Researchers consider it to be a probable reason behind the U.S. eye infection outbreak in 2004 and 2006. Between August 2004 and March 2006, there were 154 confirmed cases of the eye infection Fusarium keratitis among users of ReNu with MoistureLoc, made by Bausch & Lomb, the study authors said.

School of Medicine in Dayton, Ohio, and colleagues conducted tests on In the new study, Dr. John D. Bullock, of the Wright State University BoonshoftReNu with MoistureLoc and five other contact lens solutions. Compared to the other solutions, ReNu with MoistureLoc showed the greatest decline in antifungal activity when stored at 60 degrees C equal to 140 degrees F. Clear Care and ReNu MultiPlus performed the best, the researchers said.

When the researchers focused on the strains of Fusariam associated with the keratitis outbreak, ReNu with MoistureLoc allowed fungal growth in 27 of 84 combinations when stored at room temperature and in 67 of 84 combinations when stored at 60 degrees C again 140 degrees F.

The study authors added,

"The precise temperature, duration of exposure to elevated temperature and extent of temperature fluctuation that may diminish the antimicrobial activity of a particular contact lens solution is not known, and thus, additional studies may be warranted. However, our findings, coupled with the FDA reports of Bausch & Lomb's failure to regulate the storage and transport temperatures of the products manufactured in their Greensville plant, may be significant."

Source: pressconnects. com

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