Actually, there is a distinction between "lucid dreaming" and "vivid dreaming". Lucid dreaming is the term used for dreams in which the dreamer is aware that it is a dream. Vivid dreaming is the opposite of blurry dreams: in vivid dreams the input through the senses is clear. While most but not all lucid dreams tend to be vivid, and in most cases when we become lucid, the dream becomes more vivid; there are many vivid dreams in which the dreamer is unaware that this is a dream, and thus not lucid.