Tips - Invert white background and black text in a document

Question: If possible, how do I invert a white background and black text in a pdf document with Adobe Reader X?

Answer: There is actually a way to control this. As it is considered to be something to help people having problem seeing of some kind, it is in the Preferences, in the Accessibility tab. There we find a section "Document Color options" where you can replace the display colors.