As a matter of fact, the space is almost empty; usually the problem with observing a far star are not the gas clouds between us and that star, but any possible brighter source of light in the surrounding space of that star (e.g. other stars or nebulae). As an example consider, the Hubble Space Telescope, which works in the visible-light spectrum, as well as in the near-infrared and near-ultravioelet spectrum. On the web there are lots of images of very far galaxies photographed using visible-light. Then, I can imagine that with visible light you can see far enough, with adequate instruments.
Also, take a look at this image, taken from Wikipedia, of how far can some present-days telescopes see through the space!
Let me guess, is it possible that your question is motivated by the sci-fi novel Nemesis, by Isaac Asimov? ;)