The diet doesn't sound bad, you could try adding some other brands of food to the diet. I don't have a DBT but I do have aquatic turtles, I vary the diet as much as I can with fresh foods & commercial foods both because IMO variety is good for them.
Mazuri makes a good aquatic turtle pellet, I also use frozen fish foods for mine such as blood worms, brine shrimp, one called emerald delight (but I thaw them out first.) I use a variety of live fish & insects as well.
This new Ectotherm brand of Turtle Yummies seem to be a good treat. I found that the other day & tried it, they seem to like it.

It could be that the one eye is injured, is there a basking area he could've bumped into? Water changing shouldn't cause an eye problem but it is possible that he has some sort of eye infection.
You've heard of "pink eye" in humans & other mammals I'm sure, well that sort of thing can happen to reptiles too. Bacterial infections can just happen because bacteria is all around us.
If it's an injury that doesn't get infected it should clear up pretty quickly but if it doesn't clear up soon I'd still see that vet.
Good luck with this, let us know what happens!
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PHRatz

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• DBT has SWOLLEN EYE, water change responsible? Please Help!! - billsanostrich, Sat Nov 19 12:31:28 2005
• RE: DBT has SWOLLEN EYE, water change responsible? Please Help!! - PHRatz, Sun Nov 20 12:59:58 2005
• Thanks for the Reply more... - billsanostrich, Sun Nov 20 13:35:14 2005
• RE: Thanks for the Reply more... - PHRatz, Mon Nov 21 10:53:07 2005
• RE: DBT has SWOLLEN EYE, water change responsible? Please Help!! - honuman, Mon Nov 21 16:00:55 2005
• Good update, few more questions... - billsanostrich, Mon Nov 21 21:04:19 2005
• RE: Good update, few more questions... - honuman, Tue Nov 22 13:34:42 2005
• RE:Be very careful - erico, Wed Nov 23 14:22:28 2005
• RE: DBT has SWOLLEN EYE, water change responsible? Please Help!! - erico, Wed Nov 23 14:17:11 2005
• What kind of eye treatment? - billsanostrich, Thu Nov 24 12:05:00 2005
• RE: What kind of eye treatment? - erico, Fri Nov 25 08:52:16 2005