What guides a reader's eye movements?

Five categories of models of eye guidance in reading are described. Eye movement data from 10 college-age readers were analysed. Correlations between the lengths of successive saccades, between the durations of successive fixations, and between successive fixation durations and saccade lengths were very low. The number of fixations centering on a letter was related to the length of the word it was in. It is argued that eye movements in reading are under momentary, non-random control. Models attempting to account for eye movement data on a random basis, or by simple gain controls or visual buffer monitoring are not found acceptable.