Hello friend,
You should have a realistic approach to health issues. 
You are too much worried about the event of falling a drop of saliva of another person into your eye. You have made a lot of imaginations over that. You suspect that the person might have been HIV+. Also he must have had a wound in his mouth, the saliva coming from the mouth must have blood in it . It must be carrying HIV . The HIV falling into your eye is going to make you HIV+ and finally you will become an 
AIDS patient and you will die of AIDS. 
I have to pity over your 
anxiety. This is all because of some wrong norms and ideas the medical science has given to the public in the initial period of HIV/AIDS invention. Dear friend, take it from me no virus or bacteria can unconditionally make you sick. No seed fallen on the rock will produce a plant. There should have favourable environments for the seed to grow. Similarly no HIV can kill you unless you have a susceptibility for that. Your type of anxiety is a bad condition for your health. If this out of control fear persists in your mind , it will reduce your immunity. It is not the virus that makes you sick. It is the fear. Here the fear is associated with a fear of death because, the HIV/AIDS is an icon developed by the society and the people with vested interests as equivalent to death. In reality, any virus or or bacteria 
thrive on your body only if you are susceptible for its growth. 
Therefore my advise  to you is to understand the realities behind the HIV infection in the right manner. You have made a lot of dangerous projections in your mind. 
If you are not yet convinced, then there is nothing wrong in getting all the tests done to remain free from mental fear you are suffering.
Hope you are satisfied by my answer
Best wishes.
Dr. C. J. Varghese
Homoeopath
drcjvarghese@gmail.com