I found something about feathers changing color and diet/sickness

http://www.exoticpetvet.net/avian/feathers.html

It says:

"Stress Bars
Feather growth requires a myriad of nutrients for normal feather
development. Therefore, if there is disruption in the assimilation of
nutrients during the time of feather development, this will result in the
production of stress bars on the feathers. Stress bars appear as black or
depigmented lines that transect a feather, and multiple lines may occur at
different levels on the feathers, if multiple bouts of disruption have
occurred. If a young bird develops gastro-intestinal problems, digestive
disturbances, prolonged chilling or periods when it is not fed (nor fed
enough), this will result in the production of stress bars at the same
level on all the feathers that were developing during that time."

My bird has had some sort of gastro-intestinal problems and he eats and
eats and doesn't gain weight - at the time this started he was going
through a molt and growing in head feathers. Do you think this is what
happened? Doesn't explain the eyes, but the poor bird is obviously sick.
Like I said I've had him to two vets but believe me he hasn't died yet. It
is the same bird and I swear to you all that he has regrown his head
bars.









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