I found a deformed frog.....Help

[Billbo]

Hi, I just wanted some advice on what I should do. I have a pond in my back garden and we have loads of frogs about at the minute. I came across this frog today in my back garden and it has no eyes and a weird shaped head, it's like a round head and no eyes or eye sockets from what i can see! I don't know if I should just let nature take it's course or could you tell me what type of frog it is? or am I cruel just leaving it alone? Also it hasn't moved, it's been sat in the same spot in my back garden for about 2 hours now, when it tries to move it kind of slides along and then stops, I think it's because he cant see where he's going...

Thanks