Evaporation is a
ubiquitous threat to the quality of the tear layer surface that serves as the
most powerful focusing lens of our eyes. Sustaining this function in face of
the omnipresent threat of its evaporative degradation was a major obstacle to
the migration of our remote ancestors from their water habitat to land.
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| Dry Eye Symptoms |
The development of a tear
thickness-monitoring alarm/ tear secretion system was a key factor in the
evolution of our species.Conventional wisdom attributes the dry eye-like
symptoms of eyes with adequate tears to their accelerated evaporation. However,
observations that the volume of tears is too generous and the Meibomian glands
are normal in some of these patients question this belief and suggest the
participation of an important and still unidentified pathogenic mechanism.
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