There are several potential synonyms for the term "eye response." These might include phrases like "visual reaction," "ocular reflex," or "pupillary response." Each of these phrases could be used to describe a different aspect of how the eye behaves or responds in certain situations. For example, "visual reaction" might refer to how quickly the eye moves to track a moving object, while "pupillary response" might describe changes in the size of the pupil in response to changes in light. Whatever the specific context in which the term is being used, there are likely a number of different synonyms or related phrases that could be employed to capture the same general concept.