Sick of green

came across the following curious admission from richard zanuck in an article about 'alice in wonderland':

To create his 3D version of Lewis Carroll’s hallucinatory classic Burton is shooting his actors in front of green screens rather than on real sets, then using the latest digital technology to insert sets, props, backgrounds and even some characters into the frame in post-production – the colour green chosen as it is so far removed from skin tone. [...]

The green itself is a bilious shade, bordering on the fluorescent. The film’s Oscar-winning producer, Richard Zanuck, says that sickness and lethargy have been a constant problem among cast and crew. Burton has even had special lavender lenses fitted into his glasses to combat the effect.

'The novelty of the green wears off very quickly,’ Depp says in his trailer later, the Hatter’s make-up now gone. 'It’s exhausting, actually. I mean, I like an obstacle – I don’t mind having to spew dialogue while having to step over dolly track while some guy is holding a card and I’m talking to a piece of tape. But the green beats you up. You’re kind of befuddled at the end of the day.’

i find this interesting because green screen films having been shooting for years, including movies shot entirely against a green screen stage (such as 'sin city'), and i've never heard of this problem before.