Just the idea of touching my eye with my finger... I realize there's a contact lens between them, but that doesn't really change the ickiness of the idea to me.
One time I tried for 5 minutes to get my contact lens out, getting desperate enough to scratch from the white to the iris with my fingernail. I thought I was scratching the contact lens until I felt something weird in the side of my eye.
The fucking thing slid behind my eye at some point.
So I scratched my literal fucking eyeball with very little pain.
My vision was blurry, but I could see only one contact lens was removed in the container. I concluded that it must still be in there and that the bad vision was just my mind playing tricks on me.
Point is, you can get pretty comfortable touching your eyeball.