Droopy eye from Botox has smaller iris

I had Botox done 4 weeks ago, and I ended up with a droopy eye. I have been noticing that the iris of the droopy eye is smaller than the normal eye. Is this normal? Are both irises going to look the same after the Botox wears off? Even when I manually lift the droopy eyelid a bit to see how the eye will look when the eyelid gets better, the iris of droopy eye does not appear to have the same same size. It looks pretty weird, and I'm concerned that it will never look the same as the normal eye's iris.