I wasn't sure where to post this as I'm not sure Kassina's are classified as tree frogs, but anyway......

One of my frogs has a milky looking eye. I saw it had a piece of compost stuck to the eye the other day and I tried to gently remove it with a piece of tissue. In the end the frog wiped it off with his front foot.

Is there anything I can do? Will it get better on its own? Any ideas?