Is this fungus on my corydora’s eye?

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GreenGuy

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Excess mucous on the eye, and the fish looks like it is covered in mucous too.

Test the water quality for ammonia, nitrite, nitrate and pH.

Do a 75% water change and gravel clean the substrate every day for a week.
make sure any new water is free of chlorine/ chloramine before it's added to the tank.

If the water is good and there's no improvement after a couple of water changes, add some salt (see directions below).

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SALT
You can add rock salt (often sold as aquarium salt) or swimming pool salt to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, Bettas & gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.

The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.

After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.

If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.

If there's no improvement after a week with salt and water changes, post more pictures.
 
Though just adding my experience, I had it on one 4 year old harlequin rasbora out of the 7 I had at that time, salt didnt help, water changes didnt help, I read it can be old age blindness or old age induced immunity weakness causing fungus. The fish has it on both eyes.
In your case water changes, cleaning and bit of salt will not hurt at all.
 

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