What is the proper term for the synchronization of eye movements?
binocular coordination

Linked below is a general overview of binocular coordination which also describes how, due to independent saccades events, mammalian eyes are generally not actually very well "synchronized".

Kirkby JA, Webster LA, Blythe HI, Liversedge SP. (2008) Binocular coordination during reading and non-reading tasks. Psychol Bull. 134(5):742-63

http://www.ncbi.nlm.nih.gov/pubmed/18729571