By looking on the bright side of things.
And if you’re trying to look at things in the dark, you’re not going to see clearly unless you turn on the lights.
If you’re always trying to find the worst in a situation or somebody, you’re going to overlook the best part because you’re trying not to see it.
If you’re going around thinking that something bad is going to happen at any time, it probably will, because you’re too busy looking for the bad and ignoring the good.
Nobody ever injured their eyesight by looking on the bright side of things.