To identify when visual information is acquired during reading, an experiment was designed in which rapid display changes were made contingent upon the state of the eye. This was accomplished by programing a computer to detect within a few milliseconds whether the eye is in a saccade or fixation. By then replacing a line of text with some other line for a 30 millisecond period during the saccade or at different times during the fixation it was hoped that it could be determined when the reader was sensitive to visual input from the text. The subjects were college undergraduates. The results showed that (1) little, if any, visual information is acquired during the saccade; (2) saccadic threshold elevation does not substantially reduce the acquisition of visual information during the early portion of the fixation; (3) visual information is being acquired throughout the fixation; (4) the kind of visual information being acquired may change over the course of the fixation; and (5) eye movements are under rather immediate control, responding to stimulus manipulations within the fixation where the manipulation occurs. (MKM)