I agree with Matt that Epson salt can be helpful. This is why I recommended anti biotics explained here.
Popeye is difficult to treat in fish because it consists of three different sets of problems. First there is damage to the cornea. Next there is accumulation of fluid behind the fish’s eyeball, and finally there is an opportunistic bacterial infection.
Minor damage to the cornea can improve over time, assuming the fish is provided with optimal water conditions and a balanced, vitamin-rich diet.
Swelling of the fish’s eye will diminish with time, assuming the fish is healthy in other regards, and is provided with optimal water conditions and a healthy diet. Epsom salt helps to reduce swelling when used at a dose of 1 to 3 teaspoons per 5 gallons. While Epsom salt can be used in both freshwater and saltwater aquariums, fish are best treated this way in a quarantine
tank rather than the main display aquarium.
Antibiotics and antibacterials similar to those used to treat fin rot
are useful in preventing damage to the cornea from turning into full-blown popeye. But once popeye develops, different medications will be required. Use antibiotics formulated for use against internal and systemic infections, preferably administered in food rather than added to the water.
If you have any IAL it would help as well. If you want to just do Epson salts it would be fine but daily water changes for 10 days with the salt treatment would be most effective.