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Variant CJD and tonometry
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We read with interest the paper by Lim et al.1 The authors interestingly showed the importance of tonometer head wiping in reducing corneal epithelial cell count and the significance of damaged prism surfaces in trapping debris. They hypothesised the possible risk of variant Creutzfeld-Jakob disease (vCJD) transmission from cornea epithelial cells present on the tonometer surface. The question is really one of what constitutes the infectious dose of vCJD for this mode of transmission, and this …