Detection of Bacterial Contamination on Contact Lenses from the Flea Market

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Chatluk Rojanabenjawong
Thanaporn Kajornlaph
Supattra Detphiphatsuphanon
Noppadon Jumroon


The contact lenses are usable instead of spectacles for the benefits of sports, entertainment and
cosmetic result from the different eye colour change. Contact lenses can cause irritation of the eyes such
as dryness, conjunctivitis, inflammation and even infections. Bacterial contamination is the most common
causes. This survey aimed to detect bacterial contamination on contact lenses and check the packing
standard by the international standard organization (ISO 11978:2000(E) and the ministry of Public Health,
item contact lens. Contact lenses samples were collected from three flea markets including Phitsanulok
night bazaar market, Naresuan University market and Wat Chan walking street market. There were 15 samples
collected from five shops; three brands from each shop. The results showed that two brands of contact
lenses (13.3%) from Phitsanulok night bazaar and Naresuan University flea market were contaminated by
Micrococcus spp. and Bacillus spp.respectively. For ISO 11978:2000(E) and notification of the Ministry of
Public Health of quality product of contact lenses, the results showed that three brands (20.0%) from
Phitsanulok night bazaar market were not met the standard. This study is the preliminary results of the
prevalence of bacterial contamination of contact lenses and the quality of contact lenses products in flea


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