Not wearing the right glasses, or any glasses at all if they are needed, can have a long-term impact. For decades it was thought that deliberately under-correcting for short-sightedness—by giving children weaker glasses than they really needed—might slow down the elongation of the eyeball over time and thus slow down the progression of myopia […] But a trial conducted in Malaysia in 2002 proved this hypothesis was so wrong it had to be halted a year early.