A contact lens is a correction that nobody sees, so it is read as quiet adjustments to how you view the world. Losing one points to a sense of things going out of focus.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.