Abstract
Bacterial adherence and colonisation of hydrogel contact lenses may be a relevant factor in contact lens-related infections,particularly in users of disposable extended-wear contact lenses or of sterile contact lens care materials. The adherence of one strain of Pseudomonas aeruginosa to unworn hydrogel contact lenses was evaluated to elucidate the initial time course of adherence and to examine the effects of material charge. Adherence was evaluated using quantitative bacteriology and scanning electron microscopy (SEM). With 75% water content non-ionic contact lenses, bacterial adherence increased with time and reached a maximum after 30–60min. Organisms adhered in higher numbers to unworn non-ionic contact lenses compared with ionic lenses ( p<0.01). SEM showed no preferential adherence of bacteria to lathing marks or surface defects. After 30min incubation, a thin fixed film wasvisible with SEM and adherent bacteria were associated with fibrous material. There was little further change in appearance with longer incubation times.
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