One thing I would suggest is Tortoise Eye Drops. They can be found at the pet shop. Ours had eye infections a couple of times. We put them in once a day and after about a week/week and a half, she was much better. Also give him some nice luke warm baths to kind of rinse out any possible dirt or crud. I would be careful on the lettuce. We only do hay, grass, dandelions, kale (not very often), and cactus as a special treat. Some lettuces will not have the types of nutrients they need to grow right.