One of is most iconic abilities made the least sense for a long time, however.
He turns his X-Ray vision to “full strength” to melt the ice instead.
Turning X-Ray vision into heat becomes a question of input and output.
While there are characters who specialize in energy conversion, that wasn’t how X-Ray vision was billed.
Heat vision, it seems, is more streamlined and believable.
It’s become synonymous with the character, and he’s better off for it.