Normal human tear lysozyme concentrations are analyzed in detail. The importance of demographic temporal and environmental factors are statistically analyzed and only age is found to be a significant variant. Lysozyme levels fall continuously after 10 years of age. The role of lysozyme in eye diseases and as an index of irritation to air-oxidant levels is uncertain. The need for further studies on this enzyme is apparent.
Pietsch RL, Pearlman ME. Human Tear Lysozyme Variables. Arch Ophthalmol. 1973;90(2):94-96. doi:10.1001/archopht.1973.01000050096003