“…Blinking aids in maintaining the tear film and the removal of spent tears by initiating a pump action, which in turn draws fluid from the menisci into the lacrimal canals via the puncta. Thus, lacrimal punctal occlusion has been advocated as a therapy to promote tear stability by preserving the existing natural tears (Freeman, 1975; Dohlman, 1978; Tuberville et al ., 1982; Willis et al ., 1987; Giovagnoli and Graham, 1992; Murube and Murube, 1996; Virtanen et al ., 1996; Balaram et al ., 2001; Yen et al ., 2001). A provocative test, which would enable the clinician to decide if occlusion is the best way forward, would be of great benefit at the outset.…”