Why was young Clark Kent seen to be wearing glasses during the flashback sequence of “Superman Returns”?
It’s never clearly explained. Some have speculated that perhaps Clark was already formulating his less-than-super disguise as Clark Kent for future use. Others are suggesting that Clark’s Kryptonian senses were somehow stunted, needing glasses like any normal child might, until he’d built up enough yellow solar radiation to develop his sensory powers like x-ray vision and heat vision.