tear production
Last reviewed 01/2018
- the normal volume of tears in the eye is 6 microlitres
- the turnover rate of tears in the eye is 1.2 microlitres per minute
- the composition of tears is similar to the electrolyte concentration found in plasma; tears are rich in proteins, particularly IgA; tears also contain beta-lysin and lysozyme (both of these substances have antibacterial properties)