Bears actually have excellent eyesight.
This is actually a common misconception. Yes, bears do have an amazing sense of smell, but it does not make up for a lack of vision because they actually have excellent eyesight. Bears can see just as well as humans do during the daytime, but it is during the night that their fantastic vision pulls out all the stops. Like your family’s dog or cat, bears have amazing night vision. There is a reflective membrane on the back of their eye called the tapetum lucidum which reflects light and causes light sensitive cells to react a second time to the light and therefore greatly enhances their vision at night. This is why if you see a picture of them at night, their eyes look greenish.
So don’t be fooled….those bears will probably see you before you see them! (info found in “Bear-ology” by Sylvia Dolson)