However, not many of us, can sit at home to protect our eyes while there are so many day to day errands to run. If this is the case, and you must step out, then make sure to know these precautions. These include wearing your sunglasses when going out, washing hands thoroughly, checking on smog levels, and eating a healthy diet containing Omega 3 fatty acid. Also, make sure you're hydrated and apply lubricating eye drops when required. If you're smoker, you should know these can irritate your eyes by making it dehydrated. You can invest in a air filter to keep away the air pollutants in your house.