Is it safe to get Botox underneath my eyes in the inner corner to stop that pull? (Photo)

I’m 35, and have developed quite bad under eye fine lines from the inner corner. You can quite literally see this muscle contracting and releasing when I look in the mirror. I am very sensitive to light and I think I have an overactive squinting problem which is causing these wrinkles. Is it safe to get half a unit or a full unit in the corner to relax that muscle? I read Botox should never be done underneath the eyes, but if it’s just a very small amount and very superficial will this be ok?