Then, they have an immature digestive tract that does not kill the
virus. In adults, both the quantity injested and the salive and
stomach acid would destroy the virus.
In your case, the milk hit your eye, which is a mucous membrane alright....but the amount of virus in that minute amount of breastmilk will not transmit HIV.
Add to that the very, very low risk of transmission through the eye and the low risk that the milk was hiv infected in the 1st place. All told, no risk and no worries!