Table 1.

Thickness of tear film in different animal.

Animal	Thickness	References
Mice	7 μm	Tran et al. [32] 2003, Johnson et al. [2] 2004
Gerbils	15 μm	Prydal et al. [33] 1993
	14 μm (interferometry) 16 μm (confocal microscopy)	Prydal et al. [34] 1992
Rat	2–6 μm	Chen et al. [31] 1997, Johnson et al. [2] 1992
	11 μm (interferometry) 11 μm (confocal microscopy)	Prydal et al. [34] 1992
	7 μm (glass fiber) 13 μm (confocal microscopy)	Prydal et al. [33] 1993
Rabbit	4–7 μm	Mishima [35] 1965, Prydal et al. [34] 1992
	12 μm (interferometry) 10 μm (confocal microscopy)	Prydal et al. [34] 1992
	7 μm (glass fiber) 10 μm (confocal microscopy)	Prydal et al. [33] 1993