Just go cross-eyed till you see a blurry vision of 3 signposts
Look at the 'centre' one and wait - your eyes should slowly come into focus (can take a fair few seconds).
(
Dixipoos Bye Bye Blackbird,
Mon 23 Feb 2009, 21:53,
archived)
Blinking seems
to help too.
(
Holly Would long wheel based tranny,
Mon 23 Feb 2009, 22:02,
archived)