Use of vital staining to assess ocular surface health is largely from the work of M.S. Norn who also reported the presence of a mucous thread in the inferior conjunctival fornix in 1962. This thread of mucous has physiologic implications and this video demonstrates a common surgical finding and attempts to teach historical context leading to our use of vital stains, ocular surface physiology, and a largely forgotten historical observation.
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This film was submitted to the 36th Annual ASCRS Film Festival within the 2018 ASCRS ASOA Annual Meeting.