When someone suggests that a person looks like somebody else, but the person in question looks nothing like this suggested look-a-like.
Originated when a boy claimed amongst company that a character in an advert looked like TV pundit Chris Kamara. Those present ridiculed this claim and any foolish look-a-like suggestions were thence known as 'kamara vision'
'Oh my god, that guy looks exactly like Akon.'
(Man looks nothing like R&B star Akon)
'What! That is pure Kamara Vision. Have a word with yourself.'