think ds may be colour blind....

[fryalot]

He doesn't seem to see any difference between green and red.

When do they test for colour blindness?
Is it debilitating in any way?
Am I being stupid and paranoid?

Anyone got any experience of this?

I agree that most 21 month old children won't reliably name colours, BUT...

My bil is red/green blind. It was first noticed at school when he did things like paint the grass red. He says that to him red & green look similar to brown.

It isn't debilitating in any way though it does prevent you from following one or two careers - I think electronics engineer and airline pilot are the main ones!

Both my sons are colour blind. Optician listed loads of careers that were out - police, fire, military,pilot, train driver....

For my boys it is the shades that are confusing. Bright red on its own is fine, but a line of paint merging from blue to green is refered to as grey.

dh is colour blind - with no obvious ill-effects.
FWIW, it wasn't picked up for ages, because he always could say what colour things are - he only gets confused if they're close.
At 21 mths, I'd have thought colour confusion was 100% normal, though...