Colour Of Chickens Eyes

When I bought three of my last girls at a sale they had lovely green eyes - however, whilst they are still lovely they have changed to the standard orange colour does anyone know why - could it be one of those nasty sales tactics people use when selling chickens at a sale like saying they are on point of lay, but in fact there legs are dull so are somewhat older than point of lay etc etc etc   Thanks

Hi Thanks
I know as babies our eyes can change, just had not realised the chickens would - shame really as I loved the soft green colour... nevermind they are lovely anyway