For Berkeley (normal) vision is a language whereby God tells us about the tangible world. But prior to having experience of the tangible world, the visual language would be as meaningless as an utterly alien language. It would convey no meaning to the sighted mind.
Source: Berkeley: The Great Philosophers (The Great Philosophers Series) (Great Philosophers (Routledge (Firm))), Pages: 33..34
Contributed by: Chris