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Br J Ophthalmol 2004;88:579 doi:10.1136/bjo.2002.015776
  • Letter

Mixed infection (Pseudomonas and coagulase negative staphylococci) microbial keratitis associated with extended wear silicone hydrogel contact lens

  1. P Syam,
  2. B Hussain,
  3. C Hutchinson
  1. Department of Ophthalmology, Calderdale Royal Hospital, Salterhebble, Halifax HX3 0PW, UK
  1. Correspondence to: MrP P Syam Department of Ophthalmology, Calderdale Royal Hospital, Salterhebble, Halifax HX3 0PW, UK; ppsyamaol.com
  • Accepted 21 January 2003

Contact lens induced ulcerative keratitis is a serious complication which can be devastating for the patient if treatment is delayed. Extended wear is the commonest cause of microbial keratitis in contact lens wear.1 New extended wear silicone hydrogel contact lenses have higher oxygen transmissibility so that they can be worn continuously for 30 days. They can also be used as bandage contact lenses.

The risk of Pseudomonas microbial keratitis with overnight wear is significantly increased by contact lenses with low oxygen transmissibility.2 By virtue of high oxygen transmissibility, the silicone hydrogel contact lenses are thought to be associated with low risk of infectious keratitis.3,4 So far only four cases of microbial keratitis have …

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