I'm not sure what you mean by that, but there were plenty of films before the 1943 Meshes of the Afternoon which showed reality in fantastic, even dreamlike ways.
From the 1902 A Trip to the Moon to the 1920's The Cabinet of Dr Caligari to 1922's Nosferatu to 1927's Metropolis, and other German Expressionist films, to name just a few.
For me the new thing that Meshes of the Afternoon brought to the cinema was an explicit interest in dream symbolism.. though even that may not be that new, if you count Bunel's 1930 film L'Age d'Or and other films of the surrealist era.
Deren has often been described as being in the surrealist tradition, and I think that's accurate in as much as she was interested in artistic use of dreams and dream symbolism, and the borderline between dream and waking life.