Uptake and loss of tears from filter paper discs employed in lysozyme tests.

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Abstract
Aspects of the use of filter paper discs in collecting tear samples for lysozyme tests were studied by serial weighings of bijoux bottles and tear-moistened discs. Blotted discs carried from 1.9 to 3.6 mg tears, but for practical purposes no deposit was left in the bottle. Unblotted discs carried a greater quantity of tear fluid, but the majority deposited a proportion of this in the bottle, and a correcting factor is therefore proposed for the lysozyme assay technique of Mackie and Seal. Substantial vaporisation of tears occurred within the bottles.