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To study the dynamics of big bubble (B formation in eyes with advanced keratoconus (KC) during deep anterior lamellar keratoplasty (DALK). A retrospective review of medical records and videos of DALK surgeries performed during the period from January 2013 to December 2019 on keratoconic eyes. Eyes with formed BB, in the presence of a relatively clear stroma, were included. We studied the following parameters the location of BB commencement, duration from the start of the bubble until complete formation, and the pattern of air passage