This might seem an odd question but I decided to create an astropath character and I was told that they have a special sight and I was curious if anyone knew where it exactly states that in the rogue trader book? Just to make sure

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In terms of gameplay you see normally, except that some things that would disrupt normal vision (and some that disrupt darksight and preysense) don't disrupt your 'vision' because you are using your psychic abilities, not your eyes. The only downside is that you can't see untouchables.

In terms of lore, you have learned to interpret your psychic sense(s) to work out what eyes would normally see.

Look at the end of the chapter on the various careers. There is a section with all the special ablities of the various careers.

Thanks for the help.