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Br J Ophthalmol 82:473-475 doi:10.1136/bjo.82.5.473
  • Original Article
    • Clinical science

Evaluation of an extended period of use for preserved eye drops in hospital practice

Table 3

Incidence of microbial contamination with respect to concentration of benzalkonium chloride (BZK)

Conc (% w/v) BZK Number of eye drop residues
Contaminated Uncontaminated % Contaminated
⩽ 0.005 19 122 13.5
⩾0.01 28 454 5.8

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