Just today i realized that my bp has this greyish white ring like thing on her eye. Actually it only covers the front and rear regions of her eye, as seen in the picture. Her eye used to be nice and black before. Is this something i need to worry about? The other eye seems perfectly normal. Nice and black.

Other facts.
She is abt 4 months old.
Perfectly healthy except for some mites i see occasionally. (And deal with betadine)
Feeding regularly.
I live in thailand so weather is always optimal.
I see her yawn sometimes, but not too often though.
Feeds once every 5 days.
Last shed about 8-10 days ago.

Thanks so much guys. I've been a lil worried since i noticed it. Any input will be appreciated.