How Viagra can make your partner look like Avatars Neytiri

Blue is the colour ... Neytiri in hit movie Avatar

Blue vision: This side-effect of the erectile dysfunction pill "Viagra" could make everyone look like an extra from flick Avatar. It affects about three per cent of men on lower doses and about one in ten on the top whack.
The Viagra can affect your retina - the light-sensitive back of your eye. But it only lasts an hour or so and doesn't seem to cause any long-term harm.