get some long tweezers and put some food in the end of them and just as he's near it release it so he can eat it if he wont feed off the tweezers
are you treating the popeye ?
what are you treatment are you using ?
have you tried interpet number 9 - i used this when i saved a fish from a friend with severe popeye , it started clearing in 3 days there was a noticable difference fully cured in a week - returned to owner and still going strong though is blind in one eye