Abnormal Sensitivity
The hero's senses function in their normal manner but their normal range of sensitivity is altered. The senses detect what they normally cannot and cannot detect what they normally can.
This affects either vision or hearing, the former case, the hero sees infrared and ultraviolet light, radio waves, and radiation. In the latter case, the hero hears extremely high and low pitches.
This may be considered a handicap for human characters while for aliens this could be a fact of life. A hero can turn it into an advantage by devising a means of negating the senses of his adversary that doesn't hinder his own altered senses.