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Dry eye, also known as keratoconjunctivitis sicca, is a multifactorial disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface

Sodium fluorescein dye, excited with a blue light and observed through a yellow filter, stains principally the cornea and highlights cell damage in response to severe dry eye disease

Source  Courtesy of Innovative Eye Care