C. Lee said:
There has been a couple of different speculations on this.
1) There has been talk that it was originally planned to show that the Kents had special "lead" inbedded glasses made for him to help control his super vision.
2) It was supposed to show a parallel between young Clark no longer needing his glasses after he learns he has super powers (cut scene) to Jason no longer needing his asthma inhaler after learning he has super powers.
They are good theories, but, personaly, i don´t buy them
1) If the audience doesn´t get that, it makes no sense to be in the movie.
Anyone that watches the 1st (´cause it´s a "sequel"), will see that he only starts to wear glasses when he starts his Superman career.
2) The all parallel angle is cool, but the problem remains.....if you watch the 1st movie...
Besides, for that to have some kind of resonance, you need to put the two scenes next to one another, so people get the parallel they are trying to make.
Even if you buy those explanations, it doesn´t make sense to go jump around wearing them.
When you jump wearing glasses, they have a
strange reaction...sometimes, they just fall.