Formation of bacterial biofilm on the soft contact lens after extended wear Masayuki Kudo 1 , Akemi Harigaya 1 , Satoki Ueno 1 , Hiroyuki Yamamoto 2 , Shigemi Terakubo 2 , Chizuko Sasaki 3 , Tomohide Yonaha 3 1Dept of Ophthalmol, St. Marianna Univ Sch of Med 2Dept of Microbiol, St. Marianna Univ Sch of Med 3Center for Electron Microscope, St. Marianna Univ Sch of Med pp.1129-1132
Published Date 2002/6/15
DOI https://doi.org/10.11477/mf.1410907799
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A 88-year-old female presented with hyperemia in her right eye. She had received cataract extraction in her right eye 20 years before. She had been wearing a soft contact lens since 10 years before. The contact lens did not undergo, reportedly, regular cleaning, disinfection or exchange. Her corrected visual acuity was hand motion right. The right eye showed severe corneal edema, neovascularization, and giant papillary conjunctivitis. The contact lens was turbid with irregular surface. The corneal lesion improved after one week of topical treatment with levofloxacin. Corynebacterium spp. were cultured from conjunctival swabs. Transmission electron microscopy showed a bacterial biofilm of 10 μm in thickness adherent to and partially intruding into the surface of the contact lens. It appeared that bacterial organisms adhered to deposits on the contact lens forming a biofilm. The ocular surface, which was protected initially by some protective mechanism, was secondarily infected due to the biofilm.

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