And? Why would anybody suddenly start aging at a
superfast rate? By aging normally, Picard would stay twenty (?) years younger than otherwise; it would take
abnormally fast aging for him to get back to his earlier biological age.
By the same token, by "aging normally", LaForge's eyes would remain perfectly healthy and functional. Something abnormal would have to happen for him to lose that health and functionality.
Sure, he has the techno-contacts again soon enough. But we know that he doesn't
like normal sight - it makes him feel invalid. Whenever given the chance to choose, he chooses technology over normal vision. So of course he'd wear the contacts again over healthy eyes, after having tried out that sunrise and whatnot.
When Anij "slowed time" with the hummingbird, she and Picard experienced time in greater detail, "at a higher sampling rate", than usual - for every flap of the hummingbird wings, Picard had time to breathe in and out once (or at least Patrick Stewart did, even if the character wasn't supposed to). If Anij did the same thing in the cave, that would mean that her breathing rate would again be massively accelerated (against the benchmark speed of dust falling) and air would run out faster.
Naturally, Anij might have done the exact opposite, being smart enough to realize this is what Picard meant even if he himself didn't realize it. The sight of dust falling slowly (instead of at an accelerated pace) just needlessly confuses the issue.
Timo Saloniemi