I opened the photo separately to get a close up and it is clear to me that it is not a problem of the outer structures or basically, the cornea. When the cornea suffers a lesion it usually heals in short time if treated with water changes and/or salt and maybe antibiotics (to avoid infection). If it is a more severe lesion, the cloudiness of the cornea may persist, but many times the lens and inner structures might not be affected, therefore the fish retains enough sight to eat.
But looking at your photo I think we have a problem of the inner eye, maybe even parasites. If the fish cannot seek out food, it is blind, and I'm not the one who should tell you what you need to do. Use common sense and sensibility.
It would be nice if someone could give us a better or more hopeful opinion.
In the Fall and Winter 2012-2013 I had 16 young altum (out of a much larger group) injure their eyes right after a blackout. It was pitch black in the fish room and when the power came back several hours later, the fish went crazy, dodging into the sand and sides of the tank and scraping their eyes severely against the sand for almost 20 minutes. It was a horrible experience to just stand there and not be able to do anything to stop them.
Very few of them recovered completely. Most had severe enough lesions to slow their growth down and not be able to compete with the other healthier group. When I separated them and gave them a tank of their own, they managed to get around to the food and continued a slow growth rate... I eventually let them go to a friend and he still has most of them. They still have cloudy eyes but are able to see and eat. They are around half the size of the healthy fish from the same big group (which suffered minor or no injuries).
Most of the fish had only outer eye issues, badly scraped corneas, but two that eventually developed inner eye damage, didn't make it.
God listens. He may not always give you everything you want, when you want it; but he always gives you what you really need, when you need it most!