Parallel definition of tear film maps on distributed-memory clusters for the support of dry eye diagnosis

•Tear film maps can be used in the diagnosis of the dry eye syndrome.•Our method accelerates the generation of tear film maps on distributed-memory clusters.•Novel hybrid parallel approach that uses MPI and multithreading.•Time reduced from around 2 minutes in the state of the art to less than 10 seconds.•Runtime reduction can extend the use of tear film maps among medical experts.