Hi there,
Corneal ulcers can be due Liver Blood and Yin deficiency, causing vulnerability to Wind Heat invasion. There are a few options.
If you have Xue Fu Zhu Yu Tang, you can try that, since it helps improve circulation to the eye, tonifies Liver Blood and moves Qi. This worked for me in a Shih Tzu with corneal ulcers due to deficient tear production.
The head tilt suggests, however, more of a Yin deficiency. In that case I'd get Rehmannia Six (Liu Wei Di Huang Wan) and add 12g Gou Qi Zi and 15 Ju Hua. If you don't have LWDHW, but have Yi Guan Jian, you can use that as the base for your formula instead.
The other possibility behind corneal issues is a Shao Yang disharmony, especially if it is not just an ulcer, but keratitis (with corneal tissue accumulations and opacities). In that case, I would start with Xiao Chai Hu Tang. Shao Yang disharmonies can also cause vestibular disease
One of those should help.
Steve