Full Idea
A causal theorist can be a 'direct realist' in the sense that he can hold that the only objects of perception are external objects.
Gist of Idea
A causal theorist can be a direct realist, if all objects of perception are external
Source
E.J. Lowe (Introduction to the Philosophy of Mind [2000], Ch. 6)
Book Reference
Lowe,E.J.: 'Introduction to the Philosophy of Mind' [CUP 2000], p.147
A Reaction
There still seem to be problems with perceiving reflections, or very distant objects (the time-lag problem), or perceiving 'secondary' qualities.