Shedding tears for a good cause would indeed be worthwhile! Truly so, tears offer a non-invasive source of sample for disease prognosis, detection, assessment, classification, onset, progression, management and treatment. Several diseases either tend to develop on account of altered functionality and stability of the tear film, or the disorders themselves cause alterations in the tear quality and (or) quantity. This chapter discusses tear biomarkers for ocular as well as non-ocular diseases of the likes of diabetes, cancer, Parkinson’s etc.
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