Aloha Quinn, there are several variables in natural structure that need to be evaluated before you should consider Botox. Seek a board certified plastic surgeon or ophthalmologist to help you determine if your issues can be changed, and whether they should be treated at all. Most models and attractive people almost always have some degree of asymmetry in their appearance naturally. Asymmetry of our appearance is what makes us "interesting" although severe asymmetry is less than desirable and distracting.
Botox works to reduce the function of muscle by blocking the nerve signals to them. If your unevenness is related to the muscle function you may be able to improve this with Botox. However, there are other causes of asymmetric eyes. Your doctor should be able to advise you on the best way to proceed.
You first need an evaluation to see what is the cause of the unevenness. If your unevenness is due to a muscle, Botox can improve the unevenness in moist cases.