Summary
- Superman's heat vision, while a powerful ability, drains his solar battery quickly, rendering him powerless if overused.
- Superman's power is not infinite; his abilities are fueled by the energy he absorbs from sunlight, and his reserve of stored solar energy can be burned through by overuse of his powers, especially heat vision.
- Despite his god-like abilities, Superman is still mortal and has clear limitations, as shown in Action Comics #1058.