This means:
“Many people discard old eyeglass cases, but they can actually be repurposed in several useful ways.”
Breakdown
“Most people throw these away” = suggests that old eyeglass cases are commonly treated as useless and discarded.
“10 smart ways” = promises ten practical or creative ideas.
“Reuse old eyeglass cases” = instead of throwing them away, use them for other purposes.
Examples of what the headline might mean
Old hard-shell eyeglass cases can potentially be reused to store small electronics, charging cables, pens, sewing supplies, makeup items, jewelry, or other small objects.
Tone
This is a DIY/upcycling clickbait headline. It creates curiosity by suggesting you’ve been throwing away something that could still be surprisingly useful.
A simpler version:
“Don’t throw away old eyeglass cases—here are 10 practical ways to reuse them.”
