Suggestions for clownfish with eye injury?

I don't know how long he's had this, but I just noticed that my cinammon clown's left eye is clouded over and swollen. I have no idea what caused it except maybe he caught a jab from my new lionfish which he's been chasing around a little. I couldn't get a good pic, but does anyone have any suggestions for treatment?
 
@simontan wrote:
I don't know how long he's had this said:
Hi,

Looks like popeye, most likely an injury of some sort as you suspected. I know there are some posting on it here and talk of using epsom salt to help reduce inflammation I believe. I would read up on it prior to trying any type of treatment, impeccable water quality is a must with this type of condition. http://saltaquarium.about.com/cs/compldiagnodisease/a/aa053001.htm

Cheers,
 
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