Must the eye be washed if urine splashes back into it, and are tears pure if washing is not obligatory?

If what is mentioned is merely a whisper (waswas), then ignore it. If the impurity is real, then the eye must be washed by pouring water on the impure spot, and whatever comes out as tears will be pure. If the impurity reaches the inside of the eye, there is a difference of opinion regarding the obligation of washing it. It is safer (more cautious) to wash it if no harm is feared. If it is said that it is excused, then whatever tears come down from it are excused.