"Visions and revelations are related but not synonymous. The word "revelation" is the broader term, "visions" being but one of many ways that a revelation might be given to a person. A vision is always seen whereas a revelation might come in the form of an audible voice, an internal impression, an angelic encounter of some sort, a dream, a trance state, or a word or image disclosed to the mind of a believer. Thus whereas all visions are revelations, not all revelations are visions.
Some have actually argued that "visions" and "revelations" are unimportant, perhaps even dangerous, and that they lack the capacity to build up the church or to encourage believers. May I simply remind you that Peter declared on the day of Pentecost, citing Joel's prophecy, that the seeing of "visions" was to be a characteristic feature of the outpouring of the Spirit in the last days, i.e., in the present church age".
Sam Storms - "Of Visions and Revelations - (2 Corinthians 12:1)" - Enjoying God Ministries - Email - Wednesday, July 23, 2008