Hello
I am very glad to hear that you are wearing P-100 masks while in public. That is honestly the best way that you can protect yourself from this virus. In terms of airborne transmission- one of the things that researchers have poorly understood until recently is that most respiratory viruses- especially rhinoviruses and coronaviruses, which cause common colds- can spread via aerosols as well as droplets. What usually determines if an infection takes hold- and how severe the symptoms may be- depends on the viral load and the immune system's readiness to fight the infection. If you're tired and run down, and around someone who has a cold, you'll probably start to feel under the weather- scratchy throat, slight coughing, etc. However, if you're standing close to someone who is really sick and coughing, your viral load increases, and your body's immune system has to work harder once the infection takes hold.
One common misconception is that any time you're exposed to a pathogen, you become infected. That's not necessarily the case. Your body's innate immune system is usually very good at keeping pathogens at bay, as long as it's not overwhelmed by too many viruses or bacteria all at once. Depending on your exposure level, you might have a silent infection, or develop a severe form of the disease- anywhere along that continuum.
With that being said, anything that you can do to decrease any possible exposure to a pathogen, the better. While it has yet to be conclusively demonstrated that airborne virus particles can land in the eyes and cause infection, it is definitely theoretically possible. What has been conclusively demonstrated, however, is that people can become infected via droplets through any mucous membranes, such as the eyes, nose, or mouth. If you are close to someone who is not wearing a mask, and they are coughing, you are at risk. Personally, I wear N-95 masks and laboratory goggles whenever I leave the house. Regular glasses can help somewhat as well. So, if laboratory goggles provide nearly the same protection as an N-95 masks, I would rate glasses at around the same level of efficacy as a surgical mask.
In terms of fomite transmission, such as from packages or shoes, at this time, this does not appear to be one of the main routes of transmission. The largest proportion of confirmed cases of COVID-19, at least here in California, have come from people who continue to attend gatherings of family and friends outside of their immediate household, and then spreading the virus to members of their household. The greatest risk factor appears to be large gatherings of people in poorly ventilated spaces, or close contact with a known case of COVID-19. However, fomites have not been ruled out as a potential route of transmission, which is why it's still important to wash your hands frequently. If you wish to be extra cautious, I would recommend disinfecting anything that you bring in from the outdoors. I tend to be overly cautious, but I have a large, full-room UV lamp in my garage, and I place anything that I bring from the outdoors in the garage and run the lamp.
As for wearing masks outdoors, as long as there are no other people near you, the outdoor air would disperse any virus particles, and UV radiation from the sun would help to neutralize it. The only instances of outdoor transmission that I am aware of have been "super spreader" events, involving very large crowds of people who are not social distancing. As long as you maintain plenty of distance from other people (I would recommend at least 20 feet), you shouldn't need to wear a mask.
It really sounds like you have put a lot of thought into protecting yourself and your loved ones from this virus. I would also recommend that you shower and change your clothes as soon as you get home. Again, the chances of transmission through this route are still very low, but anything that you can do to reduce your risk adds up over time!
If I think of anything else, or come across any new information, I will post an update as soon as I can. I will also be happy to answer any further questions.
Stay safe and healthy!
-Will