My Parrot Suddenly Went Blind – Seeking Advice and Experiences

My parrot unexpectedly lost its vision, and I have no idea why. There were no prior signs of illness or injury. It’s still eating and moving around but seems confused and disoriented. Has anyone else experienced this with their bird? What could be the possible causes, and is there any way to help? I’m planning a vet visit soon, but any insights in the meantime would be really helpful.

It's a mountain parrot 🦜, one more thing there were two of them in same cage. I separated them now.

I added a video for reference